Tissue factor pathway inhibitor antibodies and uses thereof

ABSTRACT

The invention relates to antibodies, and antigen-binding fragments thereof, that specifically bind TFPI and inhibit an activity thereof. Such antibodies and fragments are useful for treating bleeding disorders and shortening clotting time.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit to U.S. Provisional Patent Application No. 62/207,229, filed on Aug. 19, 2015, and U.S. Provisional Patent Application No. 62/360,205, filed Jul. 8, 2016, which are hereby incorporated by reference herein in their entirety.

REFERENCE TO SEQUENCE LISTING

This application is being filed electronically via EFS-Web and includes an electronically submitted sequence listing in .txt format. The .txt file contains a sequence listing entitled “PC72096A_Sequence_Listing_ST25.txt” created on Aug. 10, 2016, and having a size of 224,226 bytes. The sequence listing contained in this .txt file is part of the specification and is hereby incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION

Hemophilia A and B are X-linked genetic disorders resulting from functional deficiencies of the plasma proteins Factor VIII (FVIII) or Factor IX (FIX), respectively. Clinical severity of hemophilia is related to the residual level of clotting factor activity. Factor activity of <1% is associated with a severe phenotype, moderate hemophilia is associated with a factor activity of 2%-5% and mild with a factor activity 5%-40%.

The standard of care for these disorders is replacement of the missing coagulation factor through intravenous infusions. The replacement factor is commonly a recombinant protein, such as Xyntha (Factor VIII) or BeneFIX (FIX), but plasma derived products of various purity are still in use. Treatment with replacement factor can either be episodic, treating bleeds on demand as they occur, or prophylactic, preventing bleeds by maintaining factor levels in a protective range. Significant evidence exists that prophylactic treatment prevents bleeds and the associated joint damage that is the major morbidity in hemophilic patients. Effective prophylactic treatment requires intravenous injection of factor 3-4 times each week, which results in difficulties in compliance and reduced quality of life. The cost of treatment is also expensive due to the complexity of manufacture of coagulation factors. Furthermore, a significant number of patients, up to 32% of patients with severe Hemophilia A, develop neutralizing antibodies to the administered factors, which are seen as foreign proteins by patients who have mutations in these genes. These patients require alternative means of treatment such as the bypass factor, Factor VIIa (NovoSeven).

An alternative approach to therapy is to bypass the need for replacement factors by augmenting the intact extrinsic pathway. Patients with hemophilia have some ability to stop bleeds through their intact extrinsic pathway; however this is not sufficient to shut down major bleeds or to prevent spontaneous bleeds. The extrinsic pathway is insufficient to provide protection because it is rapidly shut down by Tissue Factor Pathway Inhibitor (TFPI).

Although WO 2010/017196 (Bayer), WO 2011/109452 (Bayer), WO 2014/144577 (Bayer), WO 2010/072687 (Novo Nordisk), WO 2012/001087 (Novo Nordisk), WO 2014/140240 (Novo Nordisk), and WO 2015/007880 (Novo Nordisk) disclose antibodies that bind to human TFPI, they do not provide the antibodies of the invention which have characteristics that make them novel potential therapeutics for hemophilia.

A product that would provide prophylactic protection while reducing the frequency of dosing of coagulation factors, reducing the quantity of use of factors, allowing alternative routes of delivery (e.g., subcutaneous) and having a lower risk of generating neutralizing antibodies, would fulfill a significant unmet need for patients with hemophilia.

BRIEF SUMMARY OF THE INVENTION

Disclosed and exemplified herein are antibodies (and antigen-binding fragments thereof) that bind to the Tissue Factor Pathway Inhibitor (TFPI).

Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. Such equivalents are intended to be encompassed by the following embodiments (E).

E1. An isolated antibody or antigen-binding fragment thereof, that specifically binds to an epitope in Kunitz Domain 2 (K2) of Tissue Factor Pathway Inhibitor (TFPI), wherein said epitope comprises residues Ile105, Arg107, and Leu131, according to the numbering of SEQ ID NO: 2. E2. The antibody or antigen-binding fragment thereof of embodiment 1, wherein said antibody, or antigen-binding fragment thereof, does not bind to Kunitz Domain 1 (K1) of TFPI. E3. The antibody or antigen-binding fragment thereof of embodiment 1 or 2, wherein said epitope further comprises one or more residues selected from the group consisting of: Cys106, Gly108, Cys130, Leu131, and Gly132, according to the numbering of SEQ ID NO: 2. E4. The antibody or antigen-binding fragment thereof of any one of embodiments 1-3, wherein said epitope further comprises residues Cys106, Gly108, Cys130, Leu131, and Gly132, according to the numbering of SEQ ID NO: 2. E5. The antibody or antigen-binding fragment thereof of any one of embodiments 1-4, wherein said epitope further comprises one or more residues selected from the group consisting of: Asp102, Arg112, Tyr127, Gly129, Met134, and Glu138, according to the numbering of SEQ ID NO: 2. E6. The antibody or antigen-binding fragment thereof of any one of embodiments 1-5, wherein said epitope further comprises Asp102, Arg112, Tyr127, Gly129, Met134, and Glu138, according to the numbering of SEQ ID NO: 2. E7. The antibody or antigen-binding fragment thereof of any one of embodiments 1-6, wherein said epitope does not comprise one or more residues selected from the group consisting of: E100, E101, P103, Y109, T111, Y113, F114, N116, Q118, Q121, C122, E123, R124, F125, K126, and L140, according to the numbering of SEQ ID NO: 2. E8. The antibody or antigen-binding fragment thereof of any one of embodiments 1-7, wherein said epitope does not comprise: E100, E101, P103, Y109, T111, Y113, F114, N116, Q118, Q121, C122, E123, R124, F125, K126, and L140, according to the numbering of SEQ ID NO: 2. E9. The antibody or antigen-binding fragment thereof of any one of embodiments 1-6, wherein said epitope does not comprise one or more residues selected from the group consisting of: D31, D32, P34, C35, K36, E100, E101, P103, Y109, K126, and G128, according to the numbering of SEQ ID NO: 2. E10. The antibody or antigen-binding fragment thereof of any one of embodiments 1-6 and 9, wherein said epitope does not comprise: D31, D32, P34, C35, K36, E100, E101, P103, Y109, K126, and G128, according to the numbering of SEQ ID NO: 2. E11. The antibody or antigen-binding fragment thereof of any one of embodiments 1-10, wherein said epitope comprises one or more residues selected from the group consisting of: Asp102, Gly104, Ile105, Cys106, Arg107, Gly108, Arg112, Tyr127, Gly129, Cys130, Leu131, Gly132, Asn133, Met134, and Glu138 (according to the numbering of SEQ ID NO: 2), wherein said epitope residue has a non-zero change in buried surface area (BSA) due to interaction with said antibody or antigen-binding fragment thereof. E12. The antibody or antigen-binding fragment thereof of embodiment 11, wherein said epitope comprises: Asp102, Gly104, Ile105, Cys106, Arg107, Gly108, Arg112, Tyr127, Gly129, Cys130, Leu131, Gly132, Asn133, Met134, and Glu138 (according to the numbering of SEQ ID NO: 2). E13. The antibody or antigen-binding fragment thereof of any one of embodiments 1-12, wherein said epitope comprises one or more residues selected from the group consisting of: Asp102, Arg107, Arg 112, Tyr127, and Leu131 (according to the numbering of SEQ ID NO: 2), wherein said epitope residue participates in a hydrogen bond with a residue from said antibody or antigen-binding fragment thereof. E14. The antibody or antigen-binding fragment thereof of embodiment 13, wherein said epitope comprises: Asp102, Arg107, Arg 112, Tyr127, and Leu131 (according to the numbering of SEQ ID NO: 2). E15. The antibody or antigen-binding fragment thereof of any one of embodiments 1-14, wherein said epitope comprises one or more contact residues selected from the group consisting of: Asp102, Gly104, Ile105, Cys106, Arg107, Gly108, Arg112, Tyr127, Gly129, Cys130, Leu131, Gly132, Met134, and Glu138 (according to the numbering of SEQ ID NO: 2). E16. The antibody or antigen-binding fragment thereof of embodiment 15, wherein said epitope comprises: Asp102, Gly104, Ile105, Cys106, Arg107, Gly108, Arg112, Tyr127, Gly129, Cys130, Leu131, Gly132, Met134, and Glu138 (according to the numbering of SEQ ID NO: 2). E17. The antibody or antigen-binding fragment thereof of any one of embodiments 1-16, comprising the following heavy (H) chain and light (L) chain paratope residues that have a non-zero change in BSA due to interaction with TFPI (numbering according to Kabat): H33 Ala, H58 Tyr, H95 Leu, H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu, H100A Ser, L29 Ala, L31 Tyr, L91 Tyr, L95A Ser, and L95B Gly. E18. The antibody or antigen-binding fragment thereof of any one of embodiments 1-17, comprising the following contact residues (numbering according to Kabat): (a) H47 is Trp or Tyr; (b) H58 is Tyr; and (c) L91 is Tyr or Arg; and optionally comprising: (d) L96 is Gly or Asn. E19. The antibody or antigen-binding fragment thereof of any one of embodiments 1-18, comprising the following contact residues (numbering according to Kabat): (a) H33 is Ala, Asn, Gly, His, Lys, Met, Phe, Pro, Ser, Thr, Trp, or Val; (b) H47 is Trp or Tyr; (c) H50 is Ala, Arg, Gly, Lys, Met, Phe, Pro, Ser, Thr, Tyr, or Val; (d) H51 is Ile, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val; (e) H52 is Ser, Ala, Arg, Asn, Asp, Gln, Glu, Gly His, Ile, Leu, Lys, Met, Phe, Pro, Ser, Trp, Tyr, or Val; (f) H56 is Ser, Arg, Gly, His, Ile, Leu, Lys, Met, Phe, Pro, Ser, Thr, Trp, Tyr, or Val; (g) H58 is Tyr; (h) H95 is Leu, Gln, Ile, Phe, or Tyr; (i) H96 is Gly, Ala, Arg, Asn Asp, Gln, Ile, Lys, Met, Phe, Pro, Ser, Thr, or Val; (j) H97 is Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val; (k) H98 is Thr, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val; (l) H99 is Ser, Ala, Gly, Phe, or Pro; (m) H100 is Leu, Arg, His, Ile, Leu, Lys, Phe, Pro, Trp, Tyr, or Val; (n) H100A is Ser, Ala, Arg, Asn Asp, Gln, Glu, His, Leu, Lys, Met, Phe Pro, Ser, Thr, or Trp; (o) L29 is Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, or Trp, Tyr, Val; (p) L31 is Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val; (q) L91 is Tyr or Arg; (r) L95A is Ser, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val; (s) L95B is Ser, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val; and (t) L95C is Ser, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val; and optionally comprising the following residues: (u) L93 is Tyr, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val; and (v) L96 is Gly or Asn. E20. The antibody or antigen-binding fragment thereof of any one of embodiments 1-18, comprising the following contact residues (numbering according to Kabat): (a) H33 is Ala or Val; (b) H47 is Trp; (c) H50 is Ala; (d) H51 is Ile; (e) H52 is Ser, Arg, Lys, Phe, or Tyr; (f) H56 is Ser, Arg, or Lys; (g) H58 is Tyr; (h) H95 is Leu; (i) H96 is Gly, Ala, Arg, Asn, Lys, Pro, Ser, or Val; (j) H97 is Ala; (k) H98 is Thr, His, Ile, Leu, Met, Phe, or Tyr; (l) H99 is Ser; (m) H100 is Leu, Phe, Trp, or Tyr; (n) H100A is Ser, Arg, Asn, Gln, Glu His, Leu, Lys, Met, Phe, Pro, or Trp; (o) L29 is Ala; (p) L31 is Tyr; (q) L91 is Tyr; (r) L95A is Ser, Phe, Trp, or Tyr; (s) L95B is Gly; and (t) L95C is Ser, Arg, Asn, Gln, Glu, Ile, Leu, Lys, Met, Phe, Trp, Tyr, or Val; and optionally comprising the following residues: (u) L93 is Ser; and (v) L96 is Gly. E21. The antibody or antigen-binding fragment thereof of any one of embodiments 1-18, comprising the following contact residues (numbering according to Kabat): (a) H33 is Ala, Val, His, or Phe; (b) H47 is Trp or Tyr; (c) H50 is Ala, Thr, Ser, or Phe; (d) H51 is Ile, Arg, Lys, or Pro; (e) H52 is Ser, Phe, Arg, or Tyr; (f) H56 is Ser, Lys, Tyr, or Phe; (g) H58 is Tyr; (h) H95 is Leu, Ile, Gln, or Phe; (i) H96 is Gly, Arg, Asn, or Lys; (j) H97 is Ala, Leu, Tyr, or Ile; (k) H98 is Thr, Tyr, Phe, or His; (l) H99 is Ser, Pro, Ala, or Phe; (m) H100 is Leu, Tyr, Trp, or Phe; (n) H100A is Ser, Arg, Leu, or Trp; (o) L29 is Ala, Glu, Asp, or Gln; (p) L31 is Tyr, Glu, Asp, or Trp; (q) L91 is Ty or Arg; (r) L95A is Ser, Phe, Tyr, or His; (s) L95B is Gly, Glu, Asp, or Pro; and (t) L95C is Ser, Trp, Tyr, or Phe; and optionally comprising the following residues: (u) L93 is Ser, Glu, Asp, or His; and (v) L96 is Gly or Asn. E22. The antibody or antigen-binding fragment thereof of any one of embodiments 1-18, comprising the following contact residues (numbering according to Kabat): H33 Ala, H47 Trp, H50 Ala, H51 Ile, H52 Ser, H56 Ser, H58 Tyr, H95 Leu, H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu, H100A Ser, L29 Ala, L31 Tyr, L91 Tyr, L95A Ser, L95B Gly, and L95C Ser; and optionally comprising the following residues: L93 Ser and L96 Gly. E23. The antibody or antigen-binding fragment thereof of any one of embodiments 1-22, comprising a heavy chain variable region (VH) that comprises:

-   -   (a) a VH complementarity determining region one (CDR-H1)         comprising the amino acid sequence of SEQ ID NO: 38.     -   (b) a VH complementarity determining region two (CDR-H2)         comprising the amino acid sequence of SEQ ID NO: 39; and     -   (c) a VH complementarity determining region three (CDR-H3)         comprising the amino acid sequence of SEQ ID NO: 40.         E24. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-22, comprising the CDR-H1, CDR-H2, and CDR-H3         sequences of SEQ ID NO: 41.         E25. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-24, comprising a human VH3 framework sequence.         E26. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-24, comprising a human VH1 framework sequence.         E27. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-24, comprising a human VH5 framework sequence.         E28. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-24, comprising the VH framework sequence of         human germline IGHV3-23 or IGHV1-69.         E29. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-24, comprising the VH framework sequence of         human germline IGHV3-7.         E30. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-24, comprising a human VH germline consensus         framework sequence.         E31. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-30, comprising a VH that comprises an amino         acid sequence at least 90% identical to an amino acid sequence         selected from the group consisting of SEQ ID NOs: 41, 63, and         65.         E32. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-31, comprising a VH that comprises an amino         acid sequence selected from the group consisting of SEQ ID NOs:         41, 63, and 65.         E33. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-32, comprising a VH that comprises the amino         acid sequence of SEQ ID NO: 41.         E34. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-32, comprising a VH that comprises the amino         acid sequence of SEQ ID NO: 63.         E35. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-32, comprising a VH that comprises the amino         acid sequence of SEQ ID NO: 65.         E36. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-35, comprising a light chain variable region         (VL) that comprises:     -   (a) a VL complementarity determining region one (CDR-L1)         comprising the amino acid sequence of SEQ ID NO: 33.     -   (b) a VL complementarity determining region two (CDR-L2)         comprising the amino acid sequence of SEQ ID NO: 34; and     -   (c) a VL complementarity determining region three (CDR-L3)         comprising the amino acid sequence of SEQ ID NO: 35.         E37. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-35, comprising the CDR-L1, CDR-L2, and CDR-L3         sequences of SEQ ID NO: 36.         E38. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-37, comprising a human V_(K) framework         sequence.         E39. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-37, comprising a human V_(λ) framework         sequence.         E40. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-37, comprising the VL framework sequence of         human germline IGKV3-20.         E41. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-37, comprising the VL framework sequence of         human germline IGKV1-39.         E42. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-37, comprising a human VL germline consensus         framework sequence.         E43. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-42, comprising a VL that comprises an amino         acid sequence at least 90% identical to SEQ ID NO:36.         E44. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-43, comprising a VL that comprises the amino         acid sequence of SEQ ID NO:36.         E45. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-44, comprising a heavy chain constant region         (CH) that comprises an amino acid sequence at least 90%         identical to SEQ ID NO: 20.         E46. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-45, comprising a CH that comprises the amino         acid sequence of SEQ ID NO: 20.         E47. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-46, comprising a light chain constant         region (CL) that comprises an amino acid sequence at least 90%         identical to SEQ ID NO: 26.

E48. The antibody or antigen-binding fragment thereof of any one of embodiments 1-47, comprising a CL that comprises the amino acid sequence of SEQ ID NO: 26.

E49. The antibody or antigen-binding fragment thereof of any one of embodiments 1-48, comprising an Fc domain. E50. The antibody or antigen-binding fragment thereof of embodiment 49, wherein said Fc domain is the Fc domain of an IgA. E51. The antibody or antigen-binding fragment thereof of embodiment 50, wherein said IgA is IgA₁ or IgA₂. E52. The antibody or antigen-binding fragment thereof of embodiment 49, wherein said Fc domain is the Fc domain of an IgD. E53. The antibody or antigen-binding fragment thereof of embodiment 49, wherein said Fc domain is the Fc domain of an IgE. E54. The antibody or antigen-binding fragment thereof of embodiment 49, wherein said Fc domain is the Fc domain of an IgM. E55. The antibody or antigen-binding fragment thereof of embodiment 49, wherein said Fc domain is the Fc domain of an IgG. E56. The antibody or antigen-binding fragment thereof of embodiment 55, wherein said IgG is IgG₁, IgG₂, IgG₃, or IgG₄. E57. The antibody or antigen-binding fragment thereof of any one of embodiments 1-56, comprising a heavy chain that comprises the amino acid sequence of SEQ ID NO: 42. E58. The antibody or antigen-binding fragment thereof of any one of embodiments 1-56, comprising a heavy chain that comprises the amino acid sequence of SEQ ID NO: 64. E59. The antibody or antigen-binding fragment thereof of any one of embodiments 1-56, comprising a heavy chain that comprises the amino acid sequence of SEQ ID NO: 66. E60. The antibody or antigen-binding fragment thereof of any one of embodiments 1-59, comprising a light chain that comprises the amino acid sequence of SEQ ID NO: 37. E61. The antibody or antigen-binding fragment thereof of any one of embodiments 1-60, comprising the VH sequence encoded by the insert present in the plasmid deposited under ATCC Accession No. PTA-122329. E62. The antibody or antigen-binding fragment thereof of any one of embodiments 1-61, comprising the VL sequence encoded by the insert present in the plasmid deposited under ATCC Accession No. PTA-122328. E63. The antibody or antigen-binding fragment thereof of any one of embodiments 1-4, wherein said epitope further comprises one or more residues selected from the group consisting of: Glu100, Glu101, Asp102, Gly104, and Tyr109, according to the numbering of SEQ ID NO: 2. E64. The antibody or antigen-binding fragment thereof of any one of embodiments 1-4 and 63, wherein said epitope further comprises Glu100, Glu101, Asp102, Gly104, and Tyr109, according to the numbering of SEQ ID NO: 2. E65. The antibody or antigen-binding fragment thereof of any one of embodiments 1-4 and 63-64, wherein said epitope does not comprise one or more residues selected from the group consisting of: P103, T111, Y113, F114, N116, Q118, Q121, C122, E123, R124, F125, K126, and L140 (numbering according to SEQ ID NO: 2). E66. The antibody or antigen-binding fragment thereof of any one of embodiments 1-4 and 63-65, wherein said epitope does not comprise: P103, T111, Y113, F114, N116, Q118, Q121, C122, E123, R124, F125, K126, and L140 (numbering according to SEQ ID NO: 2). E67. The antibody or antigen-binding fragment thereof of any one of embodiments 1-4 and 63-64, wherein said epitope does not comprise one or more residues selected from the group consisting of: D31, D32, P34, C35, K36, P103, K126, Y127, G128 (numbering according to SEQ ID NO: 2). E68. The antibody or antigen-binding fragment thereof of any one of embodiments 1-4, 63-64, and 67, wherein said epitope does not comprise: D31, D32, P34, C35, K36, P103, K126, Y127, G128 (numbering according to SEQ ID NO: 2). E69. The antibody or antigen-binding fragment thereof of any one of embodiments 1-4 and 63-68, comprising the following residues (numbering according to Kabat): H33 Ala, H35 Gln, H52 Ser, H53 Asn, H55 Arg, H56 Ser, H95 Phe, H96 Leu, H97 His, H99 Ser, H101 Asp, L31 Met, L32 Tyr, L34 His, L36 Tyr, L50 Arg, L91 Trp, and L96 Tyr. E70. The antibody or antigen-binding fragment thereof of any one of embodiments 1-4 and 63-69, comprising a VH that comprises:

-   -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         48.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         49; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         50.         E71. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-69, comprising the CDR-H1, CDR-H2, and         CDR-H3 sequences of SEQ ID NO: 51.         E72. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-71, comprising a human VH3, VH1, or         VH5 framework sequence.         E73. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-72, comprising the VH framework         sequence of human germline IGHV3-23 or IGHV1-69.         E74. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-72, comprising the VH framework         sequence of human germline IGHV3-7.         E75. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-71, comprising a human VH germline         consensus framework sequence.         E76. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-75, comprising a VH that comprises an         amino acid sequence at least 90% identical to an amino acid         sequence selected from the group consisting of SEQ ID NOs: 67,         69, 51, and 79.         E77. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-76, comprising a VH that comprises an         amino acid sequence selected from the group consisting of SEQ ID         NOs: 67, 69, 51, and 79.         E78. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-77, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 67.         E79. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-77, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 69.         E80. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-77, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 51.         E81. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-77, comprising a heavy chain variable         region (VH) that comprises the amino acid sequence of SEQ ID NO:         79.         E82. The antibody or antigen-binding fragment thereof according         to any one of embodiments 1-4 and 63-81, comprising a VL that         comprises:     -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         43.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         44; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         45.         E83. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-81, comprising the CDR-L1, CDR-L2, and         CDR-L3 sequences of SEQ ID NO: 46.         E84. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-83, comprising a human V_(K) or V_(λ)         framework sequence.         E85. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-84, comprising the VL framework         sequence of human germline IGKV3-20 or IGKV1-39.         E86. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-83, comprising a human VL germline         consensus framework sequence.         E87. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-86, comprising a VL that comprises an         amino acid sequence at least 90% identical to a sequence         selected from the group consisting of SEQ ID NOs: 46, 71, 73,         75, and 77.         E88. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-87, comprising a VL that comprises an         amino acid sequence selected from the group consisting of SEQ ID         NOs: 46, 71, 73, 75, and 77.         E89. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-88, comprising a VL that comprises the         amino acid sequence of SEQ ID NO:46.         E90. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-88, comprising a VL that comprises the         amino acid sequence of SEQ ID NO:71.         E91. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-88, comprising a VL that comprises the         amino acid sequence of SEQ ID NO:73.         E92. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-88, comprising a VL that comprises the         amino acid sequence of SEQ ID NO:75.         E93. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-88, comprising a VL that comprises the         amino acid sequence of SEQ ID NO:77.         E94. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-93, comprising a CH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 20.         E95. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-94, comprising a CH that comprises the         amino acid sequence of SEQ ID NO: 20.         E96. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-95, comprising a CL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 26.         E97. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-96, comprising a CL that comprises the         amino acid sequence of SEQ ID NO: 26.         E98. The antibody or antigen-binding fragment thereof of any one         of embodiments 1-4 and 63-97, comprising an Fc domain.         E99. The antibody or antigen-binding fragment thereof of         embodiment 98, wherein said Fc domain is the Fc domain of an         IgA.         E100. The antibody or antigen-binding fragment thereof of         embodiment 99, wherein said IgA is IgA₁ or IgA₂.         E101. The antibody or antigen-binding fragment thereof of         embodiment 98, wherein said Fc domain is the Fc domain of an         IgD, IgE, or IgM.         E102. The antibody or antigen-binding fragment thereof of         embodiment 98, wherein said Fc domain is the Fc domain of an         IgG.         E103. The antibody or antigen-binding fragment thereof of         embodiment 102, wherein said IgG is IgG₁, IgG₂, IgG₃, or IgG₄.         E104. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-4 and 63-103, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 52.         E105. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-4 and 63-103, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 68.         E106. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-4 and 63-103, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 70.         E107. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-4 and 63-103, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 80.         E108. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-4 and 63-107, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 47.         E109. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-4 and 63-107, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 72.         E110. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-4 and 63-107, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 74.         E111. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-4 and 63-107, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 76.         E112. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-4 and 63-107, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 78.         E113. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to an epitope in Kunitz Domain 2 (K2) of         Tissue Factor Pathway Inhibitor (TFPI), wherein said epitope         comprises residues Glu101, Pro103, Tyr109, Thr111, Ser119,         Gln121, Glu123, Arg124, Lys126, and Leu140, according to the         numbering of SEQ ID NO: 2.         E114. The antibody or antigen-binding fragment thereof of         embodiment 113, wherein said antibody, or antigen-binding         fragment thereof, does not bind to Kunitz Domain 1 (K1) of TFPI.         E115. The antibody or antigen-binding fragment thereof of         embodiment 113 or 114, wherein said epitope does not comprise         one or more residues selected from the group consisting of:         E100, D102, R107, Y113, F114, N116, Q118, and C122 (numbering         according to SEQ ID NO: 2).         E116. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-115, wherein said epitope does not         comprise: E100, D102, R107, Y113, F114, N116, Q118, and C122         (numbering according to SEQ ID NO: 2).         E117. The antibody or antigen-binding fragment thereof of         embodiment 113 or 114, wherein said epitope does not comprise         one or more residues selected from the group consisting of: D31,         D32, P34, C35, K36, E100, 1105, R107, G108, Y127, and G128         (numbering according to SEQ ID NO: 2).         E118. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-114 and 117, wherein said epitope does         not comprise: D31, D32, P34, C35, K36, E100, 1105, R107, G108,         Y127, and G128 (numbering according to SEQ ID NO: 2).         E119. The antibody or antigen-binding fragment thereof of         embodiment 113-118, comprising the following residues (according         to Kabat numbering): H50 Asp, H57 Thr, H58 Leu, H59 Tyr, H61         Gln, H98 Asp, H99 Tyr, H100 Asp, L30 His, L50 Trp, L92 Tyr, L93         Thr, L94 Thr, and L96 Tyr.         E120. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-119, comprising a VH that comprises:     -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         87.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         88; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         89.         E121. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-119, comprising the CDR-H1, CDR-H2, and         CDR-H3 sequences of SEQ ID NO: 90.         E122. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-121, comprising a human VH3, VH1, or VH5         framework sequence.         E123. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-122, comprising the VH framework sequence         of human germline IGHV3-23, IGHV1-69, or IGHV3-7.         E124. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-121, comprising a human VH germline         consensus framework sequence.         E125. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-124, comprising a VH that comprises an         amino acid sequence at least 90% identical to an amino acid         sequence selected from the group consisting of SEQ ID NOs: 90,         95, 97, 99, 101, 103, 105, and 107.         E126. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-125, comprising a VH that comprises an         amino acid sequence selected from the group consisting of SEQ ID         NOs: 90, 95, 97, 99, 101, 103, 105, and 107.         E127. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-126, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 90.         E128. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-126, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 95.         E129. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-126, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 97.         E130. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-126, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 99.         E131. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-126, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 101.         E132. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-126, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 103.         E133. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-126, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 105.         E134. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-126, comprising a VH that comprises the         amino acid sequence of SEQ ID NO: 107.         E135. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-134, comprising a VL that comprises:     -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         81.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         82; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         83.         E136. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-134, comprising the CDR-L1, CDR-L2, and         CDR-L3 sequences of SEQ ID NO: 84.         E137. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-136, comprising a human V_(K) or V_(λ)         framework sequence.         E138. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-137, comprising the VL framework sequence         of human germline IGKV3-20 or IGKV1-39.         E139. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-136, comprising a human VL germline         consensus framework sequence.         E140. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-139, comprising a VL that comprises an         amino acid sequence at least 90% identical to an amino acid         sequence selected from the group consisting of SEQ ID NOs: 84,         109, and 111.         E141. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-140, comprising a VL that comprises an         amino acid sequence selected from the group consisting of SEQ ID         NOs: 84, 109, and 111.         E142. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-141, comprising a VL that comprises the         amino acid sequence of SEQ ID NO:84.         E143. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-141, comprising a VL that comprises the         amino acid sequence of SEQ ID NO:109.         E144. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-141, comprising a VL that comprises the         amino acid sequence of SEQ ID NO:111.         E145. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-144, comprising a CH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 20.         E146. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-145, comprising a CH that comprises the         amino acid sequence of SEQ ID NO: 20.         E147. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-144, comprising a CH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 91.         E148. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-144 and 147, comprising a CH that         comprises the amino acid sequence of SEQ ID NO: 91.         E149. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-148, comprising a CL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 14.         E150. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-149, comprising a CL that comprises the         amino acid sequence of SEQ ID NO: 14.         E151. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-148, comprising a CL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 85.         E152. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-148 and 151, comprising a CL that         comprises the amino acid sequence of SEQ ID NO: 85.         E153. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-152, comprising an Fc domain.         E154. The antibody or antigen-binding fragment thereof of         embodiment 153, wherein said Fc domain is the Fc domain of an         IgA (e.g., IgA₁ or IgA₂).         E155. The antibody or antigen-binding fragment thereof of         embodiment 153, wherein said Fc domain is the Fc domain of an         IgD, IgE, or IgM.         E156. The antibody or antigen-binding fragment thereof of         embodiment 153, wherein said Fc domain is the Fc domain of an         IgG.         E157. The antibody or antigen-binding fragment thereof of         embodiment 156, wherein said IgG is IgG₁, IgG₂, IgG₃, or IgG₄.         E158. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-157, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 92.         E159. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-157, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 94.         E160. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-157, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 96.         E161. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-157, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 98.         E162. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-157, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 100.         E163. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-157, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 102.         E164. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-157, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 104.         E165. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-157, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 106.         E166. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-157, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 108.         E167. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-166, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 86.         E168. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-166, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 93.         E169. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-166, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 110.         E170. The antibody or antigen-binding fragment thereof of any         one of embodiments 113-166, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 112.         E171. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the Kunitz Domain 2 (K2) of TFPI,         comprising a VH that comprises:     -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         16.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         17; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         18.         E172. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 19.         E173. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising a         VL that comprises:     -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         10.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         11; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         12.         E174. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 13.         E175. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising:

(i) a VH that comprises:

-   -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         16.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         17; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         18;

and (ii) a VL that comprises:

-   -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         10.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         11; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         12.         E176. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 19, and the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 13.         E177. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-176, comprising a human VH3, VH1, or VH5         framework sequence.         E178. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-177, comprising the VH framework sequence         of human germline IGHV3-23, IGHV1-69, or IGHV3-7.         E179. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-176, comprising a human VH germline         consensus framework sequence.         E180. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-179, comprising a VH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 19.         E181. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-180, comprising a VH that comprises the         amino acid sequence of SEQ ID NO. 19.         E182. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-181, comprising a human V_(K) or V_(λ)         framework sequence.         E183. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-182, comprising the VL framework sequence         of human germline IGKV3-20 or IGKV1-39.         E184. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-181, comprising a human VL germline         consensus framework sequence.         E185. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-184, comprising a VL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 13.         E186. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-185, comprising a VL that comprises the         amino acid sequence of SEQ ID NO: 13.         E187. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-186, comprising a CH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 20.         E188. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-187, comprising a CH that comprises the         amino acid sequence of SEQ ID NO: 20.         E189. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-188, comprising a CL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 14.         E190. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-189, comprising a CL that comprises the         amino acid sequence of SEQ ID NO: 14.         E191. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-190, comprising an Fc domain.         E192. The antibody or antigen-binding fragment thereof of         embodiment 191, wherein said Fc domain is the Fc domain of an         IgA (e.g., IgA₁ or IgA₂), IgD, IgE, or IgM.         E193. The antibody or antigen-binding fragment thereof of         embodiment 191, wherein said Fc domain is the Fc domain of an         IgG.         E194. The antibody or antigen-binding fragment thereof of         embodiment 193, wherein said IgG is IgG₁, IgG₂, IgG₃, or IgG₄.         E195. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-194, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 21.         E196. The antibody or antigen-binding fragment thereof of any         one of embodiments 171-195, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 15.         E197. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising a         VH that comprises:     -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         28.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         29; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         30.         E198. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 31.         E199. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising a         VL that comprises:     -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         22.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         23; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         24.         E200. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 25.         E201. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising:

(i) a VH that comprises:

-   -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         28.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         29; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         30;

and (ii) a VL that comprises:

-   -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         22.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         23; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         24.         E202. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 31, and the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 25.         E203. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-202, comprising a human VH3, VH1, or VH5         framework sequence.         E204. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-203, comprising the VH framework sequence         of human germline IGHV3-23, IGHV1-69, or IGHV3-7.         E205. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-202, comprising a human VH germline         consensus framework sequence.         E206. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-205, comprising a VH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 31.         E207. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-206, comprising a VH that comprises the         amino acid sequence of SEQ ID NO. 31.         E208. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-207, comprising a human V_(K) or V_(λ)         framework sequence.         E209. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-208, comprising the VL framework sequence         of human germline IGKV3-20 or IGKV1-39.         E210. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-207, comprising a human VL germline         consensus framework sequence.         E211. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-210, comprising a VL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 25.         E212. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-211, comprising a VL that comprises the         amino acid sequence of SEQ ID NO: 25.         E213. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-212, comprising a CH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 20.         E214. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-213, comprising a CH that comprises the         amino acid sequence of SEQ ID NO: 20.         E215. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-214, comprising a CL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 26.         E216. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-215, comprising a CL that comprises the         amino acid sequence of SEQ ID NO: 26.         E217. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-216, comprising an Fc domain.         E218. The antibody or antigen-binding fragment thereof of         embodiment 217, wherein said Fc domain is the Fc domain of an         IgA (e.g., IgA₁ or IgA₂), IgD, IgE, or IgM.         E219. The antibody or antigen-binding fragment thereof of         embodiment 217, wherein said Fc domain is the Fc domain of an         IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).         E220. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-219, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 32.         E221. The antibody or antigen-binding fragment thereof of any         one of embodiments 197-220, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 27.         E222. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising a         heavy chain variable region (VH) that comprises:     -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         58.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         59; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         60.         E223. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 61.         E224. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising a         VL that comprises:     -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         53.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         54; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         55.         E225. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 56.         E226. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds the K2 Domain of TFPI, comprising:

(i) a VH that comprises:

-   -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         58.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         59; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         60;

and (ii) a VL that comprises:

-   -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         53.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         54; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         55.         E227. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 61, and the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 56.         E228. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-227, comprising a human VH3, VH1, or VH5         framework sequence.         E229. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-228, comprising the VH framework sequence         of human germline IGHV3-23, IGHV1-69, or IGHV3-7.         E230. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-227, comprising a human VH germline         consensus framework sequence.         E231. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-230, comprising a VH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 61.         E232. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-231, comprising a VH that comprises the         amino acid sequence of SEQ ID NO. 61.         E233. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-232, comprising a human V_(K) or V_(λ)         framework sequence.         E234. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-233, comprising the VL framework sequence         of human germline IGKV3-20 or IGKV1-39.         E235. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-232, comprising a human VL germline         consensus framework sequence.         E236. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-235, comprising a VL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 56.         E237. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-236, comprising a VL that comprises the         amino acid sequence of SEQ ID NO: 56.         E238. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-237, comprising a CH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 20.         E239. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-238, comprising a CH that comprises the         amino acid sequence of SEQ ID NO: 20.         E240. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-239, comprising a CL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 26.         E241. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-240, comprising a CL that comprises the         amino acid sequence of SEQ ID NO: 26.         E242. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-241, comprising an Fc domain.         E243. The antibody or antigen-binding fragment thereof of         embodiment 242, wherein said Fc domain is the Fc domain of an         IgA (e.g., IgA₁ or IgA₂), IgD, IgE, or IgM.         E244. The antibody or antigen-binding fragment thereof of         embodiment 242, wherein said Fc domain is the Fc domain of an         IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).         E245. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-244, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 62.         E246. The antibody or antigen-binding fragment thereof of any         one of embodiments 222-245, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 57.         E247. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising a         VH that comprises:     -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         118.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         119; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         120.         E248. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 121.         E249. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising a         VL that comprises:     -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         113.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         114; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         115.         E250. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 116.         E251. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising:

(i) a VH that comprises:

-   -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         118.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         119; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         120;

and (ii) a VL that comprises:

-   -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         113.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         114; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         115.         E252. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 121, and the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 116.         E253. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-252, comprising a human VH3, VH1, or VH5         framework sequence.         E254. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-253, comprising the VH framework sequence         of human germline IGHV3-23, IGHV1-69, or IGHV3-7.         E255. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-252, comprising a human VH germline         consensus framework sequence.         E256. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-255, comprising a VH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 121.         E257. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-256, comprising a VH that comprises the         amino acid sequence of SEQ ID NO. 121.         E258. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-257, comprising a human V_(K) or V_(λ)         framework sequence.         E259. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-258, comprising the VL framework sequence         of human germline IGKV3-20 or IGKV1-39.         E260. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-257, comprising a human VL germline         consensus framework sequence.         E261. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-260, comprising a VL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 116.         E262. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-261, comprising a VL that comprises the         amino acid sequence of SEQ ID NO: 116.         E263. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-262, comprising a CH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 91.         E264. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-263, comprising a CH that comprises the         amino acid sequence of SEQ ID NO: 91.         E265. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-264, comprising a CL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 85.         E266. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-265, comprising a CL that comprises the         amino acid sequence of SEQ ID NO: 85.         E267. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-266, comprising an Fc domain.         E268. The antibody or antigen-binding fragment thereof of         embodiment 267, wherein said Fc domain is the Fc domain of an         IgA (e.g., IgA₁ or IgA₂), IgD, IgE, or IgM.         E269. The antibody or antigen-binding fragment thereof of         embodiment 267, wherein said Fc domain is the Fc domain of an         IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).         E270. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-269, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 122.         E271. The antibody or antigen-binding fragment thereof of any         one of embodiments 247-270, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 117.         E272. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising a         VH that comprises:     -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         128.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         129; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         130.         E273. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 131.         E274. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising a         VL that comprises:     -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         123.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         124; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         125.         E275. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 126.         E276. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising:

(i) a VH that comprises:

-   -   (a) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:         128.     -   (b) a CDR-H2 comprising the amino acid sequence of SEQ ID NO:         129; and     -   (c) a CDR-H3 comprising the amino acid sequence of SEQ ID NO:         130;

and (ii) a VL that comprises:

-   -   (a) a CDR-L1 comprising the amino acid sequence of SEQ ID NO:         123.     -   (b) a CDR-L2 comprising the amino acid sequence of SEQ ID NO:         124; and     -   (c) a CDR-L3 comprising the amino acid sequence of SEQ ID NO:         125.         E277. An isolated antibody, or antigen-binding fragment thereof,         that specifically binds to the K2 Domain of TFPI, comprising the         CDR-H1, CDR-H2, and CDR-H3 sequences of SEQ ID NO: 131, and the         CDR-L1, CDR-L2, and CDR-L3 sequences of SEQ ID NO: 126.         E278. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-277, comprising a human VH3, VH1, or VH5         framework sequence.         E279. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-278, comprising the VH framework sequence         of human germline IGHV3-23, IGHV1-69, or IGHV3-7.         E280. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-277, comprising a human VH germline         consensus framework sequence.         E281. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-280, comprising a VH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 131.         E282. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-281, comprising a VH that comprises the         amino acid sequence of SEQ ID NO. 131.         E283. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-282, comprising a human V_(K) or V_(λ)         framework sequence.         E284. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-283, comprising the VL framework sequence         of human germline IGKV3-20 or IGKV1-39.         E285. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-282, comprising a human VL germline         consensus framework sequence.         E286. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-285, comprising a VL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 126.         E287. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-286, comprising a VL that comprises the         amino acid sequence of SEQ ID NO: 126.         E288. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-287, comprising a CH that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 91.         E289. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-288, comprising a CH that comprises amino         acid sequence of SEQ ID NO: 91.         E290. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-289, comprising a CL that comprises an         amino acid sequence at least 90% identical to SEQ ID NO: 85.         E291. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-290, comprising a CL that comprises the         amino acid sequence of SEQ ID NO: 85.         E292. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-291, comprising an Fc domain.         E293. The antibody or antigen-binding fragment thereof of         embodiment 292, wherein said Fc domain is the Fc domain of an         IgA (e.g., IgA₁ or IgA₂), IgD, IgE, or IgM.         E294. The antibody or antigen-binding fragment thereof of         embodiment 292, wherein said Fc domain is the Fc domain of an         IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).         E295. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-294, comprising a heavy chain that         comprises the amino acid sequence of SEQ ID NO: 132.         E296. The antibody or antigen-binding fragment thereof of any         one of embodiments 272-295, comprising a light chain that         comprises the amino acid sequence of SEQ ID NO: 127.         E297. An antibody, or antigen-binding fragment thereof, that         specifically binds to the K2 Domain of TFPI, wherein said         antibody or antigen-binding fragment thereof competes for         binding to TFPI with the antibody or antigen-binding fragment         thereof of any one of embodiments 1-296.         E298. An antibody, or antigen-binding fragment thereof, that         specifically binds to the K2 Domain of TFPI, wherein said         antibody or antigen-binding fragment thereof competes for         binding to TFPI with an antibody selected from the group         consisting of: TFPI-3, TFPI-21, TFPI-23, TFPI-24, TFPI-26,         TFPI-106, TFPI-107, TFPI-108, TFPI-109, TFPI-110, TFPI-111,         TFPI-112, TFPI-113, TFPI-114, TFPI-115, TFPI-118, TFPI-119,         TFPI-122, TFPI-123, TFPI-126, 4D8.b1, mu-hu 4D8 chimera,         4D8-Vk1.0×VH1.0, 4D8-Vk1.0×VH1.1, 4D8-Vk1.0×VH1.2,         4D8-Vk1.0×VH1.3, 4D8-Vk1.0×VH1.4, 4D8-Vk1.0×VH1.5,         4D8-Vk1.0×VH1.6, 4D8-Vk1.1×VH1.0, 4D8-Vk1.1×VH1.1,         4D8-Vk1.1×VH1.2, 4D8-Vk1.1×VH1.3, 4D8-Vk1.1×VH1.4,         4D8-Vk1.1×VH1.5, 4D8-Vk1.1×VH1.6, hz4D8, 6B7.c5, and 7A4.D9.         E299. An antibody, or antigen-binding fragment thereof, that         specifically binds to the K2 Domain of TFPI, wherein said         antibody or antigen-binding fragment thereof competes for         binding to TFPI with an antibody selected from the group         consisting of: TFPI-23, TFPI-24, TFPI-106, and TFPI-118.         E300. The antibody or antigen-binding fragment thereof of         embodiment 299, wherein said antibody or antigen-binding         fragment thereof competes for binding to TFPI with TFPI-23 or         TFPI-106.         E301. The antibody or antigen-binding fragment thereof of         embodiment 299, wherein said antibody or antigen-binding         fragment thereof competes for binding to TFPI with TFPI-24 or         TFPI-118.         E302. An antibody, or antigen-binding fragment thereof, that         specifically binds to the K2 Domain of TFPI, wherein said         antibody or antigen-binding fragment thereof competes for         binding to TFPI with antibody 4D8.         E303. An antibody, or antigen-binding fragment thereof, that         specifically binds to the K2 Domain of TFPI, wherein said         antibody or antigen-binding fragment thereof binds to the same         TFPI epitope as the antibody or antigen-binding fragment thereof         of any one of embodiments 1-296.         E304. An antibody, or antigen-binding fragment thereof, that         specifically binds to the K2 Domain of TFPI, wherein said         antibody or antigen-binding fragment thereof binds to the same         TFPI epitope as an antibody selected from the group consisting         of: TFPI-3, TFPI-21, TFPI-23, TFPI-24, TFPI-26, TFPI-106,         TFPI-107, TFPI-108, TFPI-109, TFPI-110, TFPI-111, TFPI-112,         TFPI-113, TFPI-114, TFPI-115, TFPI-118, TFPI-119, TFPI-122,         TFPI-123, TFPI-126, 4D8.b1, mu-hu 4D8 chimera, 4D8-Vk1.0×VH1.0,         4D8-Vk1.0×VH1.1, 4D8-Vk1.0×VH1.2, 4D8-Vk1.0×VH1.3,         4D8-Vk1.0×VH1.4, 4D8-Vk1.0×VH1.5, 4D8-Vk1.0×VH1.6,         4D8-Vk1.1×VH1.0, 4D8-Vk1.1×VH1.1, 4D8-Vk1.1×VH1.2,         4D8-Vk1.1×VH1.3, 4D8-Vk1.1×VH1.4, 4D8-Vk1.1×VH1.5,         4D8-Vk1.1×VH1.6, hz4D8, 6B7.c5, and 7A4.D9.         E305. An antibody, or antigen-binding fragment thereof, that         specifically binds the K2 Domain of TFPI, wherein said antibody         or antigen-binding fragment thereof binds to the same TFPI         epitope as an antibody selected from the group consisting of:         TFPI-23, TFPI-24, TFPI-106, and TFPI-118.         E306. The antibody or antigen-binding fragment thereof of         embodiment 305, wherein said antibody or antigen-binding         fragment thereof binds to the same TFPI epitope as TFPI-23 or         TFPI-106.         E307. The antibody or antigen-binding fragment thereof of         embodiment 305, wherein said antibody or antigen-binding         fragment thereof binds to the same TFPI epitope as TFPI-24 or         TFPI-118.         E308. An antibody, or antigen-binding fragment thereof, that         specifically binds to the K2 Domain of TFPI, wherein said         antibody or antigen-binding fragment thereof binds to the same         TFPI epitope as antibody 4D8.         E309. The antibody or antigen-binding fragment thereof of any         one of embodiments 297-308, wherein said antibody or         antigen-binding fragment thereof does not bind to the K1 Domain         of TFPI.         E310. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-309, wherein the antibody or         antigen-binding fragment is an Fc fusion protein, a monobody, a         maxibody, a bifunctional antibody, an scFab, an scFv, a         peptibody, or an antigen-binding fragment of any of the         foregoing.         E311. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-310, wherein said antibody or         antigen-binding fragment binds to TFPI with a binding affinity         (Kd) value from about 1×10⁻⁷M to about 1×10⁻¹² M.         E312. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-311, wherein said antibody or         antigen-binding fragment binds to TFPI with a binding affinity         (Kd) value from about 5×10⁻⁷M to about 5×10⁻¹¹ M.         E313. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-312, wherein said antibody or         antigen-binding fragment binds to TFPI with a binding affinity         (Kd) value of from about 1×10⁻⁸M to about 1×10⁻¹⁰ M.         E314. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-313, wherein said antibody or         antigen-binding fragment: (i) decreases clotting time as         measured in a plasma based dilute prothrombin time (dPT)         assay; (ii) reduces clotting time in whole blood as measured by         thromboelastrography or rotational thromboelastometry; (iii)         increases thrombin generation; (iv) increases FXa activity in         the presence of TFPI; (v) enhance platelet accumulation in the         presence of TFPI; (vi) increase fibrin generation in the         presence of TFPI; or (vii) any combination thereof.         E315. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein said antibody or antigen-binding         fragment decreases clotting time as measured in a plasma based         dilute prothrombin time assay.         E316. The antibody or antigen-binding fragment thereof of         embodiment 315, wherein said decrease in clotting time, as         measured in a plasma based dilute prothrombin time assay, is         dose-dependent.         E317. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein said antibody or antigen-binding         fragment reduces clotting time in whole blood as measured by         thromboelastrography or rotational thromboelastometry.         E318. The antibody or antigen-binding fragment thereof of         embodiment 317, wherein said reduction in clotting time, as         measured by thromboelastrography or rotational         thromboelastometry, is dose-dependent.         E319. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein said antibody or antigen-binding         fragment increases thrombin generation.         E320. The antibody or antigen-binding fragment thereof of         embodiment 319, wherein said increase in thrombin generation, is         dose-dependent.         E321. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein said antibody or antigen-binding         fragment increases FXa activity in the presence of TFPI.         E322. The antibody or antigen-binding fragment thereof of         embodiment 321, wherein said increase in FXa activity in the         presence of TFPI, is dose-dependent.         E323. The antibody or antigen-binding fragment thereof of         embodiment 322, wherein said antibody enhances platelet         accumulation in the presence of TFPI.         E324. The antibody or antigen-binding fragment thereof of         embodiment 323, wherein said enhancement of platelet         accumulation in the presence of TFPI is dose-dependent.         E325. The antibody or antigen-binding fragment thereof of         embodiment 324, wherein said antibody increases fibrin         generation in the presence of TFPI.         E326. The antibody or antigen-binding fragment thereof of         embodiment 325, wherein said increase in fibrin generation in         the presence of TFPI is dose-dependent.         E327. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time in whole         blood is determined using whole blood obtained from a human         patient having severe hemophilia A.         E328. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time in whole         blood is determined using whole blood obtained from a human         patient having severe hemophilia A and inhibitory antibodies         against human Factor VIII.         E329. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time in whole         blood is determined using whole blood obtained from a human         patient having moderate hemophilia A.         E330. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time in whole         blood is determined using whole blood obtained from a human         patient having severe hemophilia B.         E331. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time in whole         blood is determined using whole blood obtained from a human         patient having severe hemophilia B and inhibitory antibodies         against human Factor IX.         E332. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time in whole         blood is determined using whole blood obtained from a human         patient having moderate hemophilia B.         E333. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time as         measured in a dPT assay is determined using plasma obtained from         a human patient having severe hemophilia A.         E334. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time as         measured in a dPT assay is determined using plasma obtained from         a human patient having severe hemophilia A and inhibitory         antibodies against human Factor VIII.         E335. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time as         measured in a dPT assay is determined using plasma obtained from         a human patient having moderate hemophilia A.         E336. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time as         measured in a dPT assay is determined using plasma obtained from         a human patient having severe hemophilia B.         E337. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time as         measured in a dPT assay is determined using plasma obtained from         a human patient having severe hemophilia B and inhibitory         antibodies against human Factor IX.         E338. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the reduction in clotting time as         measured in a dPT assay is determined using plasma obtained from         a human patient having moderate hemophilia B.         E339. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the increase in thrombin generation is         determined using plasma obtained from a human patient having         severe hemophilia A.         E340. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the increase in thrombin generation is         determined using plasma obtained from a human patient having         severe hemophilia A and inhibitory antibodies against human         Factor VIII.         E341. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the increase in thrombin generation is         determined using plasma obtained from a human patient having         moderate hemophilia A.         E342. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the increase in thrombin generation is         determined using plasma obtained from a human patient having         severe hemophilia B.         E343. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the increase in thrombin generation is         determined using plasma obtained from a human patient having         severe hemophilia B and inhibitory antibodies against human         Factor IX.         E344. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein the increase in thrombin generation is         determined using plasma obtained from a human patient having         moderate hemophilia B.         E345. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein 100 nM of said antibody or         antigen-binding fragment thereof is at least as effective in         reducing clotting time of whole blood obtained from a human         patient having severe hemophilia A as an amount of recombinant         human Factor VIII that is sufficient to achieve 5% of normal         clotting activity.         E346. The antibody or antigen-binding fragment thereof of         embodiment 314, wherein 100 nM of said antibody or         antigen-binding fragment thereof is at least as effective in         increasing peak thrombin generation in platelet rich plasma         obtained from a human patient having severe hemophilia A as an         amount of recombinant human Factor VIII that is sufficient to         achieve 5% of normal clotting activity.         E347. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-346, wherein said TFPI is human TFPI.         E348. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-347, wherein said TFPI comprises residues         91-147 SEQ ID NO: 2.         E349. An isolated nucleic acid molecule or nucleic acid         molecules, comprising one or more nucleotide sequences encoding         the antibody or antigen-binding fragment thereof of any one of         embodiments 1-348.         E350. An isolated nucleic acid molecule encoding an antibody, or         antigen-binding fragment thereof, that specifically binds TFPI,         wherein said nucleic acid comprises a nucleic acid sequence         selected from the group consisting of: the nucleic acid sequence         of SEQ ID NO:175, the nucleic acid sequence of SEQ ID NO:176,         the nucleic acid sequence of SEQ ID NO:177, the nucleic acid         sequence of SEQ ID NO:178, the nucleic acid sequence of the         insert of the vector deposited as mAb-TFPI-106 VL under ATCC         Accession Number PTA-122328, and the nucleic acid sequence of         the insert of the vector deposited as mAb-TFPI-106 VH under ATCC         Accession Number PTA-122329.         E351. A vector comprising the nucleic acid molecule of         embodiments 349 and 350.         E352. A host cell comprising the nucleic acid molecule of         embodiment 349 or 350, or the vector of embodiment 351.         E353. The host cell of embodiment 352, wherein said cell is a         mammalian cell.         E354. The host cell of embodiment 353, wherein said host cell is         a CHO cell, a HEK-293 cell, or an Sp2.0 cell.         E355. A method of making an antibody or antigen-binding fragment         thereof, comprising culturing the host cell of any one of         embodiments 352-354, under a condition wherein said antibody or         antigen-binding fragment is expressed by said host cell.         E356. The method of embodiment 355, further comprising isolating         said antibody or antigen-binding fragment thereof.         E357. An antibody or antigen-binding fragment thereof obtained         by the method of embodiment 355 or 356.         E358. A pharmaceutical composition comprising an antibody or         antigen-binding fragment thereof of any one of embodiments 1-347         and 357, and a pharmaceutically acceptable carrier or excipient.         E359. A method of reducing the activity of Tissue Factor Pathway         Inhibitor (TFPI), comprising administering to a subject in need         thereof a therapeutically effective amount of the antibody or         antigen-binding fragment thereof of any one of embodiments 1-347         and 357, or the pharmaceutical composition of embodiment 358.         E360. A method of shortening bleeding time, comprising         administering to a subject in need thereof a therapeutically         effective amount of the antibody or antigen-binding fragment         thereof of any one of embodiments 1-347 and 357, or the         pharmaceutical composition of embodiment 358.         E361. The method of embodiment 358 or 360, wherein said subject         is a human.         E362. The method of any one of embodiments 359-361, wherein said         subject suffers from or is susceptible to a deficiency in blood         coagulation.         E363. The method of any one of embodiments 359-361, wherein said         subject suffers from or is susceptible to a platelet disorder.         E364. The method of any one of embodiments 359-361, wherein said         subject suffers from or is susceptible to hemophilia A, B or C.         E365. The method of any one of embodiments 359-361, wherein said         subject suffers from or is susceptible to hemophilia A or B.         E366. The method of any one of embodiments 359-361, wherein said         subject suffers from or is susceptible to von Willebrand Disease         (vWD).         E367. The method of embodiment 360, further comprising         administering a therapeutically effective amount of FVII.         E368. The method of embodiment 367, wherein said method         increases the generation of thrombin in the presence of TFPI.         E369. The method of any one of embodiments 359-368, comprising         administering said antibody or antigen-binding fragment thereof,         or pharmaceutical composition, intravenously.         E370. The method of any one of embodiments 359-368, comprising         administering said antibody or antigen-binding fragment thereof,         or pharmaceutical composition, subcutaneously.         E371. The method of any one of embodiments 359-368, wherein said         antibody or antigen-binding fragment thereof, or pharmaceutical         composition, is administered once every 3 days, once every 4         days, once every 5 days, once every 6 days, once a week, or         twice a week.         E372. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-347 and 357, or the pharmaceutical         composition of embodiment 358, for use as a medicament.         E373. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-347 and 357, or the pharmaceutical         composition of embodiment 358 for use in reducing the activity         of TFPI in a subject.         E374. The antibody or antigen-binding fragment thereof of any         one of embodiments 1-347 and 357, or the pharmaceutical         composition of embodiment 357 for use in shortening bleeding         time in a subject.         E375. The antibody or antigen-binding fragment, or         pharmaceutical composition of any one of embodiments 372-374,         wherein said subject is a human.         E376. The antibody or antigen-binding fragment, or         pharmaceutical composition of any one of embodiments 372-375,         wherein said subject suffers from or is susceptible to a         deficiency in blood coagulation.         E377. The antibody or antigen-binding fragment, or         pharmaceutical composition of any one of embodiments 372-375,         wherein said subject suffers from or is susceptible to         hemophilia A, B or C.         E378. The antibody or antigen-binding fragment, or         pharmaceutical composition of any one of embodiments 372-375,         wherein said subject suffers from or is susceptible to         hemophilia A or B.         E379. The antibody or antigen-binding fragment, or         pharmaceutical composition of any one of embodiments 372-375,         wherein said subject suffers from or is susceptible to von         Willebrand Disease (vWD).         E380. The antibody or antigen-binding fragment, or         pharmaceutical composition of any one of embodiments 372-375,         wherein said subject suffers from or is susceptible to a         platelet disorder.         E381. Use of the antibody or antigen-binding fragment thereof of         any one of embodiments 1-348 and 357, or the pharmaceutical         composition of embodiment 358, for reducing the activity of TFPI         in a subject.         E382. Use of the antibody or antigen-binding fragment thereof of         any one of embodiments 1-348 and 357, or the pharmaceutical         composition of embodiment 358, in the manufacture of a         medicament for reducing the activity of TFPI in a subject.         E383. Use of the antibody or antigen-binding fragment thereof of         any one of embodiments 1-348 and 357, or the pharmaceutical         composition of embodiment 358, for shortening bleeding time in a         subject.         E384. Use of the antibody or antigen-binding fragment thereof of         any one of embodiments 1-348 and 357, or the pharmaceutical         composition of embodiment 358, in the manufacture of a         medicament for shortening bleeding time in a subject.         E385. The use of any one of embodiments 381-384, wherein said         subject is a human.         E386. The use of any one of embodiments 381-384, wherein said         subject suffers from or is susceptible to a deficiency in blood         coagulation.         E387. The use of any one of embodiments 381-384, wherein said         subject suffers from or is susceptible to hemophilia A, B or C.         E388. The use of any one of embodiments 381-384, wherein said         subject suffers from or is susceptible to hemophilia A or B.         E389. The use of any one of embodiments 381-384, wherein said         subject suffers from or is susceptible to von Willebrand Disease         (vWD).         E390. The use of any one of embodiments 381-384, wherein said         subject suffers from or is susceptible to a platelet disorder.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A-1F are drawings showing the co-crystal structures of various anti-TFPI antibodies and the K2 domain of TFPI. In particular, as shown in FIG. 1F, exemplary antibodies disclosed herein, TFPI-23, TFPI-24, and 4D8, all bind to non-overlapping epitopes of the K2 domain as compared to other reference antibodies. TFPI-106 binds to the same site as TFPI-23, and TFPI-118 bind to the same site as TFPI-24. “R&D” or “R&D Fab” refers to antibody Mab 2974 from R&D Systems. Novo2021 antibody is also called “hz4F36.” “Clone 23” refers to TFPI-23; “clone 24” refers to TFPI-24.

FIGS. 2A-2E are diagrams showing the interactions between epitopes residues within the K2 domain of TFPI and paratope residues from various anti-TFPI antibodies. “R&D” or “R&D Fab” refers to Mab 2974 from R&D Systems. “Clone 23” refers to TFPI-23; “clone 24” refers to TFPI-24.

FIGS. 3A-3E show the in vivo efficacies of various anti-TFPI antibodies in a mouse injury model. FIGS. 3A and 3B show the duration in decreasing bleeding in Hemophilia A Factor VIII deficient (FVIII−/−) mice when 2A8-200 and 2A8 antibodies (used as reference antibodies in this study) were administered. FIG. 3C shows the duration of effect in Hemophilia A mice when TFPI 4D8 (control), TFPI-21, TFPI-23, and TFPI-24 antibodies were administered. FIGS. 3D and 3E show the duration of Hemophilia A mice when TFPI-106 and TFPI-118 antibodies were administered. Antibodies were administered to hemophilia A mice (FVIII−/−) by intravenous injection at 6 mg/kg at the indicated time points (hours (h)) before injury. Total volume of blood loss (μL) was then measured after tail transection. Vehicle (saline) treated hemophilia A mice served as a control. All measurements are presented as mean±SEM. *=P<0.05. FVIII+/+(wild-type) mice received saline. n=5/group.

FIG. 4 shows the duration of bleeding in Hemophilia B mice after tail transection when TFPI-106 antibody was administered. Antibodies were administered to hemophilia B mice by intravenous injection at 6 mg/kg at the indicated time points (hours (h)) before injury. Total volume of blood loss (μL) was then measured after tail transection. Vehicle (saline) treated hemophilia A mice served as a control. All measurements are presented as mean±SEM. *=P<0.05. n=4-5/group.

FIG. 5, comprising panels A and B, each of which comprises six panels (FIG. 5A, 1 through 6 and FIG. 5B, 1 through 6) shows microphotographs of intravital microscopy (IVM) demonstrating that TFPI is detected in the platelet thrombus and along the endothelium in vivo at the site of vessel injury in a wild type mouse. FIG. 5A shows the increase in platelet thrombus at the site of injury as detected using Dylight 649-labeled CD42c that binds GP1bβ on platelets. The presence or absence of platelets is demonstrated by the fluorescence signal detected in panel 1 (0 sec); panel 2 (15 sec); panel 3 (30 sec); panel 4 (60 sec); panel 5 (90 sec); and panel 6 (120 sec). Alexa 488-labeled negative control IgG was also administered, and no fluorescence was detected. FIG. 5B, comprising panels 1-6, shows microphotographs of IVM demonstrating that TFPI is present in the platelet thrombus and along the endothelium after laser induced vessel injury in wild type mice. Alexa 488-labeled TFPI (green signal shown as gray) is not detected at 0 seconds (FIG. 5B, panel 1) and a faint signal can be seen at 15 seconds (FIG. 5B, panel 2). At 30 seconds (FIG. 5B, panel 3) the green fluorescence signal has increased and a faint red signal (Dylight 649-labeled CD42c) can be seen indicating detection of platelet accumulation at approximately the same site where TFPI is detected. FIG. 5B, panel 4 (60 seconds) shows strong green and red fluorescent signals (both light gray where red fluorescence can be seen to the left of the vessel injury site and green signal is primarily detected towards the right side of the injury site) demonstrating both platelet accumulation and TFPI are detected at the site of injury. FIG. 5B, panel 5, shows both red (platelets) and green (TFPI) fluorescence signals at the site of injury by 60 seconds where both signals are greater than at 30 seconds. FIG. 5B, panel 6, shows decreased red signal (platelets) and decreased green signal (TFPI) both still detectable at the site of injury at 120 seconds.

FIG. 6A is a graph showing the hemostatic effect of TFPI-106 in hemophilia A mice after laser induced vessel injury as assessed using IVM where the amount of platelet thrombus is expressed as the area under the curve (AUC) (*=P<0.005 is indicated). FIG. 6A shows the accumulation of platelets at the site of injury in wild type mice (WT) at 0.5 hours post-injury where the mice received only saline control compared with the lack of platelet accumulation in the hemophilia A mouse at 0.5 hours where saline was administered. Platelet accumulation was detected in hemophilia A mice at 0.5 hours where recombinant factor VIII (rFVIII) or TFPI-106 was administered. The thrombus accumulation effect was still detected at 168 hours in hemophilia A mice administered TFPI-106.

FIG. 6B is a graph showing the hemostatic effect of TFPI-106 in hemophilia A mice after laser induced vessel injury as assessed using IVM where the amount of fibrin generation is expressed as the area under the curve (AUC) (*=P<0.005 is indicated). FIG. 6B shows the generation of fibrin at the site of injury in wild type mice (VVT) at 0.5 hours post-injury where the mice received only saline control compared with the lack of detectable fibrin generation in the hemophilia A mouse at 0.5 hours where saline was administered. Fibrin generation was detected in hemophilia A mice at 0.5 hours where recombinant factor VIII (rFVIII) or TFPI-106 was administered. The fibrin generation effect was still detected at 168 hours in hemophilia A mice administered TFPI-106.

FIG. 7 depicts a graph showing the effect on a thrombin generation assay (TGA) of administration of TFPI-106 and recombinant factor VIIa (rFVIIa) in severe hemophilia A plasma in the presence of 1 pm tissue factor and 4 μM phospholipids. The graph shows the thrombograms for hemophilia A plasma with TFPI-106 alone (16 μg/ml) and in combination with rFVIIa (20 μg/ml; 2 μg/ml; or 0.2 μg/ml). Also shown are the thrombograms for hemophilic A plasma and non-hemophilic plasma with neither TFPI-106 nor rFVIIa.

FIG. 8A depicts thrombograms showing the effect on thrombin generation in the presence of 1 pM tissue factor and 4 μM phospholipids in hemophilia A plasma in the presence of TFPI-106 with or without rFVIIa or in the presence of rFVIIa only. Non-hemophilic plasma is included as a control.

FIG. 8B depicts thrombograms showing the effect on thrombin generation in the presence of three Bethesda Units (3 BU) of an inhibitor in citrated platelet poor hemophilia A plasma in the presence of TFPI-106 with or without rFVIIa or in the presence of rFVIIa only. Non-hemophilic plasma is included as a control. Also included a control non-hemophilic plasma to which TFPI-106 (16 μg/ml) was added.

FIG. 8C depicts thrombograms showing the effect on thrombin generation in the presence of three Bethesda Units (3 BU) of an inhibitor in citrated platelet poor hemophilia B plasma in the presence of TFPI-106 with or without rFVIIa or in the presence of rFVIIa only. Non-hemophilic plasma is included as a control. Also included a control non-hemophilic plasma to which TFPI-106 (16 μg/ml) was added.

FIG. 9A shows the effect on blood loss compared to control of administering antibody TFPI-106 (6 mg/kg) and separately recombinant Factor VIII (200 units/kg) to hemophilia A mice immediately after tail transection. FIG. 9B shows the effect on blood loss compared to control of administering three different doses of antibody TFPI-106 (6 mg/kg) and separately recombinant Factor VIII (200 units/kg) to hemophilia A mice 2 minutes after tail transection.

FIG. 10A shows the effect of different concentrations of TFPI 106 compared to recombinant Factor VIII on clotting time of whole blood from a human patient with severe hemophilia A. FIG. 10B shows the effect of different concentrations of TFPI 106 compared to recombinant Factor VIII on peak thrombin generation in platelet rich plasma from a human patient with severe hemophilia A.

FIG. 11A shows the effect of different concentrations of TFPI 106 on clotting time of whole blood from a human patient with severe hemophilia A and inhibitors to FVIII. FIG. 11B shows the effect of different concentrations of TFPI 106 on peak thrombin generation in platelet rich plasma from a human patient with severe hemophilia A and inhibitors to FVIII. FIG. 11C shows the effect of different concentrations of TFPI 106 on clotting time of platelet poor plasma from a human patient with severe hemophilia A and inhibitors to FVIII.

FIG. 12A shows the effect of different concentrations of TFPI 106 compared to recombinant Factor VIII on clotting time of whole blood from a human patient with moderate hemophilia A. FIG. 12B shows the effect of different concentrations of TFPI 106 compared to recombinant Factor VIII on peak thrombin generation in platelet rich plasma from a human patient with moderate hemophilia A. FIG. 12C shows the effect of different concentrations of TFPI 106 on clotting time of platelet poor plasma from a human patient with moderate hemophilia A.

FIG. 13A shows the effect of different concentrations of TFPI 106 compared to recombinant Factor IX on clotting time of whole blood from a human patient with moderate hemophilia B. FIG. 13B shows the effect of different concentrations of TFPI 106 compared to recombinant Factor IX on peak thrombin generation in platelet rich plasma from a human patient with moderate hemophilia B. FIG. 13C shows the effect of different concentrations of TFPI 106 on clotting time of platelet poor plasma from a human patient with moderate hemophilia B.

FIG. 14A shows the effect of different concentrations of TFPI 106 compared to recombinant Factor VIII on clotting time of whole blood from multiple human patients with hemophilia A. FIG. 14B shows the effect of different concentrations of TFPI 106 compared to recombinant Factor VIII on peak thrombin generation in platelet rich plasma from multiple human patients with hemophilia A. FIG. 14C shows the effect of different concentrations of TFPI 106 on clotting time of platelet poor plasma from multiple human patients with hemophilia B.

DETAILED DESCRIPTION OF THE INVENTION 1. Overview

As noted above, patients with hemophilia have some ability to stop bleeds through their intact extrinsic pathway; however the extrinsic pathway is insufficient to provide protection because it is rapidly shut down by the Tissue Factor Pathway Inhibitor (TFPI). Blocking/neutralizing TFPI inhibition in these patients can compensate for an inadequate FXa generation and normalize the bleeding diathesis. Accordingly, disclosed and exemplified herein are antibodies and antigen-binding fragments thereof that specifically bind to TFPI and inhibit the activity thereof.

2. Definitions

By “reducing the activity of TFPI” is meant that the antibody or antigen-binding fragment thereof can: (i) decrease clotting time when compared to the clotting time in the absence of the antibody as measured by, e.g., a plasma based dilute prothrombin time assay; (ii) reduce clotting time in whole blood as compared to the clotting time in the absence of the antibody as measured by, e.g., thromboelastrography or rotational thromboelastometry; (iii) increase thrombin generation; (iv) increase FXa activity in the presence of TFPI; (v) enhance platelet accumulation in the presence of TFPI; (vi) increase fibrin generation in the presence of TFPI; or (vii) any combination thereof. The inhibitory activities of an antibody or antigen-binding fragment can, but need not be dose-dependent (e.g., causing a dose-dependent decrease in clotting time as measured in a plasma based dilute prothrombin time assay).

Further, as disclosed and exemplified herein, co-crystal structures of anti-TFPI antibodies and the Kunitz Domain 2 (K2 domain) of TFPI were obtained. Structural analysis shows that the exemplary antibodies of the invention recognize unique epitopes of TFPI, as compared to other publicly disclosed TFPI antibodies (which were used as references antibodies in the Examples). For example, as shown in FIGS. 1A-1F and FIGS. 2A-2E, as compared to several reference TFPI antibodies (R&D (Mab2974) Fab, Novo2021 (also called hz4F36) Fab, 2A8 Fab), TFPI-23, TFPI-24, and 4D8 antibodies bind to non-overlapping sites in the K2 domain of TFPI.

Accordingly, in certain embodiments, the antibodies (and antigen-binding fragments) disclosed herein recognize a unique epitope of TFPI, located at the K2 domain of TFPI. Based on the co-crystal structure and computational alanine scan, this epitope comprises three residues that are important for antibody-antigen interactions: Ile105, Arg107, and Leu131 (according to the numbering of human TFPI as shown in SEQ ID NO: 2). Mutating these three residues to Alanine results in loss of antibody binding. For example, antibodies TFPI-23 and its variants (e.g., TFPI-106 and TFPI-107) all recognize this epitope.

In certain embodiments, the recognition of key epitope residues disclosed herein allows the antibodies (and antigen-binding fragments thereof) to reduce the activity of TFPI. In particular, the crystal structure shows that the K2 domain of TFPI adopts a cone-shaped structure, with the tip of the cone (especially Arg107) binding to FXa. TFPI-23 and TFPI-24 both recognize the tip of this cone-shaped region and block the binding of TFPI to FXa. Antibody 4D8 recognizes a different epitope in K2 domain. Although not interacting directly with residues at the tip of the cone, 4D8 nonetheless blocks the binding of TFPI to FXa. Table 16 summarizes the non-overlapping epitope residues recognized by the exemplary antibodies disclosed herein, as compared to other publicly known TFPI antibodies.

Further, in certain embodiments, antibodies and antigen-binding fragments thereof disclosed herein have demonstrated desirable pharmacological activities and pharmacokinetic properties for treatment of coagulation deficiencies (such as hemophilia) and for reducing bleeding time.

An antibody that “preferentially binds” or “specifically binds” (used interchangeably herein) to an epitope is a term well understood in the art, and methods to determine such specific or preferential binding are also well known in the art. A molecule is said to exhibit “specific binding” or “preferential binding” if it reacts or associates more frequently, more rapidly, with greater duration and/or with greater affinity with a particular cell or substance than it does with alternative cells or substances. An antibody “specifically binds” or “preferentially binds” to a target if it binds with greater affinity, avidity, more readily, and/or with greater duration than it binds to other substances. Also, an antibody “specifically binds” or “preferentially binds” to a target if it binds with greater affinity, avidity, more readily, and/or with greater duration to that target in a sample than it binds to other substances present in the sample. For example, an antibody that specifically or preferentially binds to a TFPI epitope is an antibody that binds this epitope with greater affinity, avidity, more readily, and/or with greater duration than it binds to other TFPI epitopes or non-TFPI epitopes. It is also understood by reading this definition, for example, that an antibody (or moiety or epitope) which specifically or preferentially binds to a first target may or may not specifically or preferentially bind to a second target. As such, “specific binding” or “preferential binding” does not necessarily require (although it can include) exclusive binding. Generally, but not necessarily, reference to binding means preferential binding. “Specific binding” or “preferential binding” includes a compound, e.g., a protein, a nucleic acid, an antibody, and the like, which recognizes and binds to a specific molecule, but does not substantially recognize or bind other molecules in a sample. For instance, an antibody or a peptide receptor which recognizes and binds to a cognate ligand or binding partner (e.g., an anti-TFPI antibody that binds TFPI) in a sample, but does not substantially recognize or bind other molecules in the sample, specifically binds to that cognate ligand or binding partner. Thus, under designated assay conditions, the specified binding moiety (e.g., an antibody or an antigen-binding portion thereof or a receptor or a ligand binding portion thereof) binds preferentially to a particular target molecule and does not bind in a significant amount to other components present in a test sample.

A variety of assay formats may be used to select an antibody or peptide that specifically binds a molecule of interest. For example, solid-phase ELISA immunoassay, immunoprecipitation, Biacore™ (GE Healthcare, Piscataway, N.J.), KinExA, fluorescence-activated cell sorting (FACS), Octet™ (ForteBio, Inc., Menlo Park, Calif.) and Western blot analysis are among many assays that may be used to identify an antibody that specifically reacts with an antigen or a receptor, or ligand binding portion thereof, that specifically binds with a cognate ligand or binding partner. Typically, a specific or selective reaction will be at least twice the background signal or noise, more typically more than 10 times background, even more typically, more than 50 times background, more typically, more than 100 times background, yet more typically, more than 500 times background, even more typically, more than 1000 times background, and even more typically, more than 10,000 times background. Also, an antibody is said to “specifically bind” an antigen when the equilibrium dissociation constant (K_(D)) is ≦7 nM.

The term “binding affinity” is herein used as a measure of the strength of a non-covalent interaction between two molecules, e.g., and antibody, or fragment thereof, and an antigen. The term “binding affinity” is used to describe monovalent interactions (intrinsic activity).

Binding affinity between two molecules, e.g. an antibody, or fragment thereof, and an antigen, through a monovalent interaction may be quantified by determination of the dissociation constant (K_(D)). In turn, K_(D) can be determined by measurement of the kinetics of complex formation and dissociation using, e.g., the surface plasmon resonance (SPR) method (Biacore). The rate constants corresponding to the association and the dissociation of a monovalent complex are referred to as the association rate constants k_(a) (or k_(on)) and dissociation rate constant k_(d) (or k_(off)), respectively. K_(D) is related to k_(a) and k_(d) through the equation K_(D)=k_(d)/k_(a). The value of the dissociation constant can be determined directly by well-known methods, and can be computed even for complex mixtures by methods such as those, for example, set forth in Caceci et al. (1984, Byte 9: 340-362). For example, the K_(D) may be established using a double-filter nitrocellulose filter binding assay such as that disclosed by Wong & Lohman (1993, Proc. Natl. Acad. Sci. USA 90: 5428-5432). Other standard assays to evaluate the binding ability of ligands such as antibodies towards target antigens are known in the art, including for example, ELISAs, Western blots, RIAs, and flow cytometry analysis, and other assays exemplified elsewhere herein. The binding kinetics and binding affinity of the antibody also can be assessed by standard assays known in the art, such as Surface Plasmon Resonance (SPR), e.g. by using a Biacore™ system, or KinExA.

A competitive binding assay can be conducted in which the binding of the antibody to the antigen is compared to the binding of the target by another ligand of that target, such as another antibody or a soluble receptor that otherwise binds the target. The concentration at which 50% inhibition occurs is known as the K_(i). Under ideal conditions, the K_(i) is equivalent to K_(D). The _(Ki) value will never be less than the K_(D), so measurement of K_(i) can conveniently be substituted to provide an upper limit for K_(D).

Following the above definition, binding affinities associated with different molecular interactions, e.g., comparison of the binding affinity of different antibodies for a given antigen, may be compared by comparison of the K_(D) values for the individual antibody/antigen complexes. K_(D) values for antibodies or other binding partners can be determined using methods well established in the art. One method for determining the K_(D) is by using surface plasmon resonance, typically using a biosensor system such as a Biacore® system.

Similarly, the specificity of an interaction may be assessed by determination and comparison of the K_(D) value for the interaction of interest, e.g., a specific interaction between an antibody and an antigen, with the K_(D) value of an interaction not of interest, e.g., a control antibody known not to bind TFPI.

An antibody that specifically binds its target may bind its target with a high affinity, that is, exhibiting a low K_(D) as discussed above, and may bind to other, non-target molecules with a lower affinity. For example, the antibody may bind to non-target molecules with a K_(D) of 1×10⁻⁶M or more, more preferably 1×10⁻⁵ M or more, more preferably 1×10⁻⁴ M or more, more preferably 1×10⁻³ M or more, even more preferably 1×10⁻² M or more. An antibody of the invention is preferably capable of binding to its target with an affinity that is at least two-fold, 10-fold, 50-fold, 100-fold 200-fold, 500-fold, 1,000-fold or 10,000-fold or greater than its affinity for binding to another non-TFPI molecule.

In general, a TFPI antibody needs to bind to TFPI with high affinity, in order to effectively reduce the activities of TFPI. However, when the binding affinity of an antibody is too high, the antibody can quickly get internalized and degraded by a host cell. This could potentially result in a short half-life and repeated injections. For example, antibody TFPI-23 shows a lower binding affinity (Kd) as compared to TFPI-24, and under certain circumstances, appears more desirable for clinical uses because it has a lower internalization rate and longer half-life. Accordingly, binding affinities (Kd) from 5×10⁻⁷M to about 5×10⁻¹¹ M, in particular from about 1×10⁻⁸M to about 1×10⁻¹⁰ M, are generally desirable, especially for treating a chronic condition (e.g., hemophilia) that require repeated injections. Without wishing to be bound by any particular theory, this affinity range is believed to strike a balance between (i) binding affinities that are needed for effectively inhibiting the activities of TFPI, and (ii) a longer half-life and reduced antibody internalization.

Specific amino acid residue positions in TFPI are numbered according to SEQ ID NO: 2 (human TFPIα K1K2K3). However, the present invention is not limited to SEQ ID NO: 2. Corresponding residues from other TFPI homologs, isoforms, variants, or fragments can be identified according to sequence alignment or structural alignment that is known in the art. For example, alignments can be done by hand or by using well-known sequence alignment programs such as ClustalW2, or “BLAST 2 Sequences” using default parameters. For example, Arg107 of SEQ ID NO: 2 corresponds to Arg104 of Mouse TFPI K1K2 (SEQ ID NO: 4).

An “antigen-binding fragment” of an antibody refers to a fragment of a full-length antibody that retains the ability to specifically bind to an antigen (preferably with substantially the same binding affinity). Examples of an antigen-binding fragment includes (i) a Fab fragment, a monovalent fragment consisting of the VL, VH, CL and CH1 domains; (ii) a F(ab′)2 fragment, a bivalent fragment comprising two Fab fragments linked by a disulfide bridge at the hinge region; (iii) a Fd fragment consisting of the VH and CH1 domains; (iv) a Fv fragment consisting of the VL and VH domains of a single arm of an antibody, (v) a dAb fragment (Ward et al., (1989) Nature 341:544-546), which consists of a VH domain; and (vi) an isolated complementarity determining region (CDR), disulfide-linked Fvs (dsFv), and anti-idiotypic (anti-Id) antibodies and intrabodies. Furthermore, although the two domains of the Fv fragment, VL and VH, are coded for by separate genes, they can be joined, using recombinant methods, by a synthetic linker that enables them to be made as a single protein chain in which the VL and VH regions pair to form monovalent molecules (known as single chain Fv (scFv)); see e.g., Bird et al. Science 242:423-426 (1988) and Huston et al. Proc. Natl. Acad. Sci. USA 85:5879-5883 (1988)). Other forms of single chain antibodies, such as diabodies are also encompassed. Diabodies are bivalent, bispecific antibodies in which VH and VL domains are expressed on a single polypeptide chain, but using a linker that is too short to allow for pairing between the two domains on the same chain, thereby forcing the domains to pair with complementary domains of another chain and creating two antigen-binding sites (see e.g., Holliger et al. Proc. Natl. Acad. Sci. USA 90:6444-6448 (1993); Poljak et al., 1994, Structure 2:1121-1123).

An antibody “variable domain” refers to the variable region of the antibody light chain (VL) or the variable region of the antibody heavy chain (VH), either alone or in combination. As known in the art, the variable regions of the heavy and light chains each consist of four framework regions (FR) connected by three complementarity determining regions (CDRs), and contribute to the formation of the antigen-binding site of antibodies.

Residues in a variable domain are numbered according Kabat, which is a numbering system used for heavy chain variable domains or light chain variable domains of the compilation of antibodies. See, Kabat et al., Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md. (1991)). Using this numbering system, the actual linear amino acid sequence may contain fewer or additional amino acids corresponding to a shortening of, or insertion into, a FR or CDR of the variable domain. For example, a heavy chain variable domain may include a single amino acid insert (residue 52a according to Kabat) after residue 52 of H2 and inserted residues (e.g. residues 82a, 82b, and 82c, according to Kabat) after heavy chain FR residue 82. The Kabat numbering of residues may be determined for a given antibody by alignment at regions of homology of the sequence of the antibody with a “standard” Kabat numbered sequence. Various algorithms for assigning Kabat numbering are available. The algorithm implemented in the 2012 release of Abysis (www.abysis.org) is used herein to assign Kabat numbering to variable regions unless otherwise noted.

Specific amino acid residue positions in an antibody (such as paratope residues disclosed herein) are also numbered according to Kabat.

“Complementarity Determining Regions” (CDRs) can be identified according to the definitions of the Kabat, Chothia, the accumulation of both Kabat and Chothia, AbM, contact, and/or conformational definitions or any method of CDR determination well known in the art. See, e.g., Kabat et al., 1991, Sequences of Proteins of Immunological Interest, 5th ed. (hypervariable regions); Chothia et al., 1989, Nature 342:877-883 (structural loop structures). AbM definition of CDRs is a compromise between Kabat and Chothia and uses Oxford Molecular's AbM antibody modeling software (Accelrys®). The “contact” definition of CDRs is based on observed antigen contacts, set forth in MacCallum et al., 1996, J. Mol. Biol., 262:732-745. The “conformational” definition of CDRs is based on residues that make enthalpic contributions to antigen binding (see, e.g., Makabe et al., 2008, Journal of Biological Chemistry, 283:1156-1166). Still other CDR boundary definitions may not strictly follow one of the above approaches, but will nonetheless overlap with at least a portion of the Kabat CDRs, although they may be shortened or lengthened in light of prediction or experimental findings that particular residues or groups of residues or even entire CDRs do not significantly impact antigen binding. As used herein, a CDR may refer to CDRs defined by any approach known in the art, including combinations of approaches.

In the Examples (see Tables 3 and 4), the CDRs are defined as follows (numbering according to Kabat; H: heavy chain; L: light chain):

-   -   CDR-H1: H26-H35B; CDR-H2: H50-H65; CDR-H3: H95-H102     -   CDR-L1: L24-L34; CDR-L2: L50-L56; CDR-L3: L89-L97

“Framework” (FR) residues are antibody variable domain residues other than the CDR residues. A VH or VL domain framework comprises four framework sub-regions, FR1, FR2, FR3 and FR4, interspersed with CDRs in the following structure: FR1-CDR1-FR2-CDR2-FR3-CDR3-FR4. In the Examples (see Tables 3 and 4), FR residues include the following (numbering according to Kabat; H: heavy chain; L: light chain):

FR1 FR2 FR3 FR4 Heavy Chain H1-H25 H36-H49 H66-H94 H103-H113 Light Chain L1-L23 L35-L49 L57-L88  L98-L107

An “epitope” refers to the area or region of an antigen (Ag) to which an antibody specifically binds, e.g., an area or region comprising residues that interacts with the antibody (Ab). Epitopes can be linear or conformational. In a linear epitope, all of the points of interaction between the protein and the interacting molecule (such as an antibody) occur linearly along the primary amino acid sequence of the protein. A “nonlinear epitope” or “conformational epitope” comprises noncontiguous polypeptides (or amino acids) within the antigenic protein to which an antibody specific to the epitope binds. The term “epitope” as used herein, is defined as a portion of an antigen to which an antibody can specifically bind as determined by any method well known in the art, for example, by conventional immunoassays. Alternatively, during the discovery process, the generation and characterization of antibodies may elucidate information about desirable epitopes. From this information, it is then possible to competitively screen antibodies for binding to the same epitope. An approach to achieve this is to conduct competition and cross-competition studies to find antibodies that compete or cross-compete with one another for binding to TFPI. That is, the antibodies compete for binding to the antigen such that the antibodies compete for binding to the antigen-binding site of an anti-TFPI antibody of the disclosure.

The term “paratope” is derived from the above definition of “epitope” by reversing the perspective, and refers to the area or region of an antibody molecule which is involved in binding of an antigen, e.g., an area or region comprising residues that interacts with the antigen. A paratope may be linear or conformational (such as discontinuous residues in CDRs).

The epitope/paratope for a given antibody/antigen binding pair can be defined and characterized at different levels of detail using a variety of experimental and computational epitope mapping methods. The experimental methods include mutagenesis, X-ray crystallography, Nuclear Magnetic Resonance (NMR) spectroscopy, Hydrogen/deuterium exchange Mass Spectrometry (HX-MS) and various competition binding methods. As each method relies on a unique principle, the description of an epitope is intimately linked to the method by which it has been determined. Thus, the epitope/paratope for a given antibody/antigen pair will be defined differently depending on the mapping method employed.

At its most detailed level, the epitope/paratope for the interaction between the Ag and the Ab can be defined by the spatial coordinates defining the atomic contacts present in the Ag-Ab interaction, as well as information about their relative contributions to the binding thermodynamics. At one level, an epitope/paratope residue can be characterized by the spatial coordinates defining the atomic contacts between the Ag and Ab. In one aspect, the a epitope/paratope residue can be defined by a specific criterion, e.g., distance between atoms in the Ab and the Ag (e.g., a distance of equal to or less than 4 Å from a heavy atom of the cognate antibody and a heavy atom of the antigen (“contact” residues)). In another aspect, an epitope/paratope residue can be characterized as participating in a hydrogen bond interaction with the cognate antibody/antigen, or with a water molecule that is also hydrogen bonded to the cognate antibody/antigen (water-mediated hydrogen bonding). In another aspect, an epitope/paratope residue can be characterized as forming a salt bridge with a residue of the cognate antibody/antigen. In yet another aspect, an epitope/paratope residue can be characterized as a residue having a non-zero change in buried surface area (BSA) due to interaction with the cognate antibody/antigen. At a further less detailed level, epitope/paratope can be characterized through function, e.g., by competition binding with other Abs. The epitope/paratope can also be defined more generically as comprising amino acid residues for which substitution by another amino acid will alter the characteristics of the interaction between the Ab and Ag (e.g. alanine scanning).

In the context of an X-ray derived crystal structure defined by spatial coordinates of a complex between an antibody, e.g., a Fab fragment or two Fab fragments, and its antigen, unless otherwise specified, an epitope residue refers to a TFPI residue (i) having a heavy atom (i.e., a non-hydrogen atom) that is within a distance of 4 Å from a heavy atom of the cognate antibody (also called “contact” residues); (ii) participating in a hydrogen bond with a residue of the cognate antibody, or with a water molecule that is also hydrogen bonded to the cognate antibody (water-mediated hydrogen bonding), (iii) participating in a salt bridge to a residue of the cognate antibody, and/or (iv) having a non-zero change in buried surface area (BSA) due to interaction with the cognate antibody. In general, a cutoff is imposed for BSA to avoid inclusion of residues that have minimal interactions. Therefore, unless otherwise specified, epitope residues under category (iv) are selected if it has a BSA of 20 Å² or greater, or is involved in electrostatic interactions when the antibody binds to TFPI. Similarly, in the context of an X-ray derived crystal structure, unless otherwise specified or contradicted by context, a paratope residue, refers to an antibody residue (i) having a heavy atom (i.e., a non-hydrogen atom) that is within a distance of 4 Å from a heavy atom of TFPI (also called “contact” residues), (ii) participating in a hydrogen bond with a TFPI residue, or with a water molecule that is also hydrogen bonded to TFPI (water-mediated hydrogen bonding), (iii) participating in a salt bridge to a residue of TFPI, and/or (iv) having a non-zero change in buried surface area due to interaction with TFPI. Again, unless otherwise specified, paratope residues under category (iv) are selected if it has a BSA of 20 Å² or greater, or is involved in electrostatic interactions when antibody binds to TFPI.

From the fact that descriptions and definitions of epitopes, dependent on the epitope mapping method used, and obtained at different levels of detail, it follows that comparison of epitopes for different Abs on the same Ag can similarly be conducted at different levels of detail. For example, epitopes described on the amino acid level, e.g., determined from an X-ray structure, are said to be identical if they contain the same set of amino acid residues. Epitopes are said to be separate (unique) if no amino acid residue is shared by the epitopes. Epitopes characterized by competition binding are said to be overlapping if the binding of the corresponding antibodies are mutually exclusive, i.e., binding of one antibody excludes simultaneous or consecutive binding of the other antibody; and epitopes are said to be separate (unique) if the antigen is able to accommodate binding of both corresponding antibodies simultaneously.

The epitope and paratope for a given antibody/antigen pair may be identified by routine methods. For example, the general location of an epitope may be determined by assessing the ability of an antibody to bind to different fragments or variant TFPI polypeptides as more fully described previously elsewhere herein. Specific residues within TFPI that make contact with specific residues within an antibody may also be determined using routine methods, such as those described in the examples. For example, antibody/antigen complex may be crystallized. The crystal structure may be determined and used to identify specific sites of interaction between the antibody and antigen.

The term “compete”, as used herein with regard to an antibody, means that binding of a first antibody, or an antigen-binding portion thereof, to an antigen reduces the subsequent binding of the same antigen by a second antibody or an antigen-binding portion thereof. In general, the binding a first antibody creates steric hindrance, conformational change, or binding to a common epitope (or portion thereof), such that the binding of the second antibody to the same antigen is reduced. Standard competition assays may be used to determine whether two antibodies compete with each other. One suitable assay for antibody competition involves the use of the Biacore technology, which can measure the extent of interactions using surface plasmon resonance (SPR) technology, typically using a biosensor system (such as a BIACORE® system). For example, SPR can be used in an in vitro competitive binding inhibition assay to determine the ability of one antibody to inhibit the binding of a second antibody. Another assay for measuring antibody competition uses an ELISA-based approach. Furthermore, a high throughput process for “binning” antibodies based upon their competition is described in International Patent Application No. WO2003/48731. Competition is present if one antibody (or fragment) reduces the binding of another antibody (or fragment) to TFPI. For example, a sequential binding competition assay may be used, with different antibodies being added sequentially. The first antibody may be added to reach binding that is close to saturation. Then, the second antibody is added. If the binding of second antibody to TFPI is not detected, or is significantly reduced (e.g., at least about 10%, at least about 20%, at least about 30%, at least about 40%, at least about 50%, at least about 60%, at least about 70%, at least about 80%, or at least about 90% reduction) as compared to a parallel assay in the absence of the first antibody (which value can be set as 100%), the two antibodies are considered as competing with each other. An exemplary antibody competition assay (and overlapping epitope analysis) by SPR is provided in Example 6.

An anti-TFPI antibody of the disclosure may have the ability to compete or cross-compete with another antibody of the disclosure for binding to TFPI as described herein. For example, an antibody of the disclosure may compete or cross-compete with antibodies described herein for binding to TFPI, or to a suitable fragment or variant of TFPI that is bound by the antibodies disclosed herein.

That is, if a first anti-TFPI antibody competes with a second antibody for binding to TFPI, but it does not compete where the second antibody is first bound to TFPI, it is deemed to “compete” with the second antibody (also referred to as unidirectional competition). Where an antibody competes with another antibody regardless of which antibody is first bound to TFPI, then the antibody “cross-competes” for binding to TFPI with the other antibody. Such competing or cross-competing antibodies can be identified based on their ability to compete/cross-compete with a known antibody of the disclosure in standard binding assays. For example, SPR, e.g., by using a Biacore™ system, ELISA assays or flow cytometry may be used to demonstrate competition/cross-competition. Such competition/cross-competition may suggest that the two antibodies bind to identical, overlapping or similar epitopes.

An anti-TFPI antibody of the disclosure may therefore be identified by a method that comprises a binding assay which assesses whether or not a test antibody is able to compete/cross-compete with a reference antibody of the disclosure (e.g., TFPI-3, TFPI-21, TFPI-23, TFPI-24, TFPI-26, TFPI-106, TFPI-107, TFPI-108, TFPI-109, TFPI-110, TFPI-111, TFPI-112, TFPI-113, TFPI-114, 4D8, 6B7.c5, 7A4.D9) for a binding site on the target molecule.

An “Fc fusion” protein is a protein wherein one or more polypeptides are operably linked to an Fc polypeptide. An Fc fusion combines the Fc region of an immunoglobulin with a fusion partner.

The binding affinity of an antibody can be expressed as Kd value, which refers to the dissociation rate of a particular antigen-antibody interaction. Kd is the ratio of the rate of dissociation, also called the “off-rate (koff)”, to the association rate, or “on-rate (kon)”. Thus, Kd equals koff/kon and is expressed as a molar concentration (M), and the smaller the Kd, the stronger the affinity of binding. Kd values for antibodies can be determined using methods well established in the art. One exemplary method for measuring Kd is surface plasmon resonance (SPR), typically using a biosensor system such as a BIACORE® system. BIAcore kinetic analysis comprises analyzing the binding and dissociation of an antigen from chips with immobilized molecules (e.g. molecules comprising epitope binding domains), on their surface. Another method for determining the Kd of an antibody is by using Bio-Layer Interferometry, typically using OCTET® technology (Octet QKe system, ForteBio). Alternatively or in addition, a KinExA® (Kinetic Exclusion Assay) assay, available from Sapidyne Instruments (Boise, Id.) can also be used.

The term “therapeutically effective amount” means an amount of an anti-TFPI antibody or a fragment thereof, or a combination comprising such antibody or fragment thereof, that is of sufficient quantity to achieve the intended purpose, such as an increase in coagulation, or in the case of hemophilia, a decrease in clotting time, or otherwise causing a measurable benefit in vivo to a subject in need. The precise amount will depend upon numerous factors, including, but not limited to the components and physical characteristics of the therapeutic composition, intended patient population, individual patient considerations, and the like, and can be determined by one skilled in the art.

By the term “synergistic therapeutic effective amount,” is meant an amount of an anti-TFPI antibody or an antigen-binding fragment thereof that when provided with a second therapeutic agent, e.g., factor VIIa (FVIIa), provides a measureable benefit (e.g., decreased clotting time, decreased bleeding time, increased fibrin generation, enhanced platelet accumulation, and the like) that is greater than the additive measurable effect of each therapeutic agent or antibody administered alone.

The term “treatment” includes prophylactic and/or therapeutic treatments. If it is administered prior to clinical manifestation of a condition, the treatment is considered prophylactic. Therapeutic treatment includes, e.g., ameliorating or reducing the severity of a disease, or shortening the length of the disease.

The term “about”, as used here, refers to +/−10% of a value.

3. Anti-TFPI Antibodies

Disclosed and exemplified herein are antibodies (and antigen-binding fragments thereof) that bind to the Tissue Factor Pathway Inhibitor (TFPI). The antibodies and antibody fragments bind to unique epitopes of TFPI. In certain embodiments, the recognition of certain epitope residues in TFPI allows the antibodies (and antigen-binding fragments thereof) to reduce the activity of TFPI. Further, in certain embodiments, antibodies (and antigen-binding fragments thereof) disclosed herein have demonstrated desirable pharmacological activities and pharmacokinetic properties for treatment of coagulation deficiencies and reducing bleeding time.

A. Tissue Factor Pathway Inhibitor (TFPI)

TFPI is a multi-valent Kunitz domain containing protease inhibitor. Exemplary sequences of human, mouse, cynomolgus monkey, rabbit, and rat TFPI are provided in Table 2.

Human TFPI is an extracellular glycoprotein with two predominant forms, TFPI-alpha and TFPI-beta. TFPI alpha, which is a 276 amino acid glycosylated protein (MW 43kD) is the largest form of TFPI and consists of three Kunitz like domains and a basic carboxy terminal region. Alternative splicing produces TFPI-beta, which contains Kunitz Domain 1 (K1) and Kunitz Domain 2 (K2), but contains an alternative C-terminal portion lacking Kunitz domain 3 (K3) and the basic region. TFPI-beta is anchored to cell membranes through post-translational modification with a glycosylphosphatidylinositol (GPI) anchor.

The primary targets of TFPI are the proteases Factor Xa (FXa) and Factor VIIa (FVIIa), which are key factors in the initiation stage of the coagulation cascade. Biochemical analysis has revealed that K2 is the inhibitor of FXa, while K1 inhibits FVIIa-Tissue Factor complex. The role of K3 is unclear as it does not seem to have direct protease inhibitory activity, but may serve as a recognition site for the co-factor Protein S. The C-terminal domain, unique to TFPI-alpha, may be involved in the recognition of prothrombinase on the platelet surface.

Kunitz domain 1 (K1) corresponds to amino acid residues 26-76 of SEQ ID NO: 2, and Kunitz domain 2 (K2) corresponds to residues 91 to 147 of SEQ ID NO: 2. The K1 and K2 domains from other TFPI homologs, isoforms, variants, or fragments can be identified by sequence alignment or structural alignment against SEQ ID NO: 2.

The TFPI of the instant disclosure includes any naturally occurring form of TFPI which may be derived from any suitable organism. For example, TFPI may be a mammalian TFPI, such as human, mouse, rat, non-human primate, bovine, ovine, canine, feline, or porcine TFPI. In certain embodiments, the TFPI is human TFPI. The TFPI may be a mature form of TFPI (i.e., a TFPI protein that has undergone post-translational processing within a suitable cell). Such a mature TFPI protein may, for example, be glycosylated.

The TFPI of the instant disclosure includes any functional fragments or variants derived from a naturally occurring TFPI. A functional fragment of TFPI can be any part or portion of TFPI that retains the activity of a TFPI, such as the ability to inhibit Factor Xa (FXa), to inhibit the activity of FVIIa-tissue factor complex, and/or to function as a negative regulator of coagulation or hemostasis. For example, a functional fragment may comprise a Kunitz domain, such as the K1 domain, K2 domain, or both K1 and K2 domains of TFPI.

A functional variant can comprise one or more mutations as compared to a naturally occurring TFPI, and still retain the activity of a naturally occurring TFPI, such as the ability to inhibit Factor Xa (FXa), or the ability to inhibit the activity of FVIIa-tissue factor complex. For example, a variant may have various degrees of sequence identity to SEQ ID NOs: 1, 2, 3, 4, 5, 6, or 7, such as at least 60%, 70%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% identical to the sequence recited in SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, or SEQ ID NO: 7.

The TPFI fragments, variants, isoforms and homologs of the invention should maintain important epitope residues (such as Ile105, Arg107, and Leu131, if TFPI-23 and TFPI-24 antibodies are used) as described herein. In addition, the TFPI may comprise five or more, eight or more, ten or more, twelve or more or fifteen or more surface accessible residues of the K2 domain of TFPI. A surface accessible residue is a residue having more than 40% relative accessibility.

For example, for the K2 domain of TFPI (see, e.g., SEQ ID NO: 2), the following amino acid residues have a greater than 40% relative accessibility: 94-95, 98, 100-110, 118-121, 123-124, 131, 134, 138-142 and 144-145. The TFPI may comprise five or more, eight or more, ten or more, twelve or more or fifteen or more of these residues, such as a fragment of TFPI that includes five or more, eight or more, ten or more, twelve or more or fifteen or more of these residues.

B. Anti-TFPI Antibodies

The antibody or antigen-binding fragment thereof of the invention specifically binds the K2 domain of TFPI, and can inhibit its interaction with FXa and/or reduce the activities of TFPI.

TFPI-23 and Variants

In one aspect, the invention includes antibody TFPI-23, and variants of TFPI-23 that were made to increase the content of human framework germline residues (“germlining”). For example, TFPI-106 comprises H1Q to E and H5V to L mutations (Kabat numbering) and TFPI-107 comprises H1Q to E, H5V to L and H941 to K mutations (Kabat numbering). For purposes of this invention, TFPI-23 parental antibody and TFPI-106 germline variant are interchangeable in their epitope residue and paratope residue interactions.

In one aspect, the invention provides an isolated antibody, or antigen-binding fragment thereof, that specifically binds to an epitope in Kunitz Domain 2 (K2) of Tissue Factor Pathway Inhibitor (TFPI), wherein said epitope comprises residues Ile105, Arg107, and Leu131, according to the numbering of SEQ ID NO: 2. In certain embodiments, the antibody or antigen-binding fragment thereof does not bind to Kunitz Domain 1 (K1) of TFPI.

As disclosed and exemplified herein, based on the co-crystal structure and computational alanine scan, unique epitopes in the K2 domain of TFPI have been discovered. In particular, the crystal structure shows that the K2 domain of TFPI adopts a cone-shaped structure, with the tip of the cone (especially Arg107) binding to FXa. TFPI-23, TFPI-24, and their variants all recognize residues near the tip of this cone-shaped region, and block the binding of TFPI to FXa. Therefore, antibodies recognizing epitope residues located near the tip of the cone are particularly useful for inhibiting TFPI activities.

In certain embodiments, the invention discloses TFPI epitopes that comprise three residues that are important for antibody-antigen interaction: Ile105, Arg107, and Leu131 (according to the numbering of human TFPI, as shown in SEQ ID NO: 2). Mutating these three residues to Alanine results in loss of binding by TFPI-23, TFPI-24, and their variants. See Table 28, which summarizes the alanine scan results.

Additional TPFI residues have also been identified as involved in antibody binding, but these residues can be mutated to Alanine without a significant destabilizing effect. See Table 28. Accordingly, in certain embodiments, the TFPI epitopes further comprise one or more residues selected from the group consisting of: Cys106, Gly108, Cys130, Gly132 (according to the numbering of SEQ ID NO: 2), and any combination thereof. These epitope residues are recognized by TFPI-23, TFPI-24, and their variants. See Table 27, which shows the common epitopes residues shared by TFPI-23 and TFPI-24.

In certain embodiments, the epitope further comprises one or more residues selected from the group consisting of: Asp102, Arg112, Tyr127, Gly129, Met134, Glu138 (according to the numbering of SEQ ID NO: 2), and any combination thereof. These epitopes residues are recognized by TFPI-23 and its variants (e.g., TFPI-106, TFPI-107), but not by TFPI-24 (and its variants). See Table 27.

In certain embodiments, the epitope does not comprise one or more residues selected from the group consisting of: E100, E101, P103, Y109, T111, Y113, F114, N116, Q118, Q121, C122, E123, R124, F125, K126, L140 (numbering according to SEQ ID NO: 2), and any combination thereof. See, Table 27. According to WO201007269 (Novo Nordisk), reference antibody 4F36 recognizes an epitope comprising E100, E101, P103, Y109, T111, Y113, F114, N116, Q118, Q121, C122, E123, R124, F125, K126, and L140.

In certain embodiments, the epitope does not comprise one or more residues selected from the group consisting of: D31, D32, P34, C35, K36, E100, E101, P103, Y109, K126, G128 (numbering according to SEQ ID NO: 2), and any combination thereof. See, Table 27. According to Table 27, reference antibodies 2A8 and 2A8-200 recognize an epitope comprising D31, D32, P34, C35, K36, E100, E101, P103, Y109, K126, and G128.

In certain embodiments, the epitope may refer to one or more TFPI “contact” residues (having a heavy atom (i.e., a non-hydrogen atom) that is within a distance of 4 Å from a heavy atom of the cognate antibody), and comprises one or more residues selected from the group consisting of: Asp102, Gly104, Ile105, Cys106, Arg107, Gly108, Arg112, Tyr127, Gly129, Cys130, Leu131, Gly132, Met134, Glu138 (according to the numbering of SEQ ID NO: 2), and any combination thereof. See, Table 29B.

In certain embodiments, the epitope may refer to one or more TFPI residues participating in a hydrogen bond with a residue of the antibody, or with a water molecule that is also hydrogen bonded to the cognate antibody (water-mediated hydrogen bonding), and comprises one or more residues selected from the group consisting of: Asp102, Arg107, Arg 112, Tyr127, and Leu131 (according to the numbering of SEQ ID NO: 2), and any combination thereof. These epitope residues participate in a hydrogen bond with the cognate antibody. See, Table 29B.

In certain embodiments, the epitope may refer to residues having a non-zero change in buried surface area (BSA) due to interaction with the cognate antibody, and comprises one or more residues selected from the group consisting of: Asp102, Gly104, Ile105, Cys106, Arg107, Gly108, Arg112, Tyr127, Gly129, Cys130, Leu131, Gly132, Asn133, Met134, Glu138 (according to the numbering of SEQ ID NO: 2), and any combination thereof. These. See, Table 29B.

Any combination of these different categories of epitope residues are also encompassed by the invention.

In certain embodiments, the epitope comprises at least 1, at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, or all of epitope residues described above, or any combination of the various categories of epitope residues described above.

Paratope residues of TFPI-23 (and variants) may refer to contact residues (within 4 Å of a TFPI epitope residue) as follows: H33 Ala, H47 Trp, H50 Ala, H51 Ile, H52 Ser, H56 Ser, H58 Tyr, H95 Leu, H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu, H100A Ser, L29 Ala, L31 Tyr, L91 Tyr, L95A Ser, L95B Gly, and L95C Ser; and optionally L93 Ser and L96 Gly (numbering according to Kabat). L93 Ser (4.07 Å) and L96 Gly (4.03 Å) are optional because the distances marginally exceed 4 Å, but are close enough to be rounded to 4 Å.

Note that the above contact residues are original residues from TFPI-23 antibody. However, based on the structural analysis and alanine scanning, it is believed that a number of contact residues in TFPI-23 can be substituted with another residue without significantly affect antigen-binding. For example, Table 29A shows that a number of contact residues in TFPI-23 can be substituted with other residues and only results in <0.5 kcal/mol effect on binding or stability (“<0.5 kcal/mol” means that a substitution has a neutral effect on binding). In particular, as shown in Table 29A, column 4, three CDR positions and 1 framework position: H47, H58, L91, and L96 (numbering according to Kabat) only tolerate one or two residues: (a) H47 is Trp or Tyr; (b) H58 is Tyr; (c) L91 is Tyr or Arg; and (d) L96 is Gly or Asn. Other CDR positions can accommodated more substitutions as summarized in Table 29A, column 4.

Accordingly, in certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises the following residues (numbering according to Kabat):

-   -   (a) H33 is Ala, Asn, Gly, His, Lys, Met, Phe, Pro, Ser, Thr,         Trp, or Val;     -   (b) H47 is Trp or Tyr;     -   (c) H50 is Ala, Arg, Gly, Lys, Met, Phe, Pro, Ser, Thr, Tyr, or         Val;     -   (d) H51 is Ile, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys,         Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val;     -   (e) H52 is Ser, Ala, Arg, Asn, Asp, Gln, Glu, Gly His, Ile, Leu,         Lys, Met, Phe, Pro, Ser, Trp, Tyr, or Val;     -   (f) H56 is Ser, Arg, Gly, His, Ile, Leu, Lys, Met, Phe, Pro,         Ser, Thr, Trp, Tyr, or Val;     -   (g) H58 is Tyr;     -   (h) H95 is Leu, Gln, Ile, Phe, or Tyr;     -   (i) H96 is Gly, Ala, Arg, Asn Asp, Gln, Ile, Lys, Met, Phe, Pro,         Ser, Thr, or Val;     -   (j) H97 is Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met,         Phe Pro, Ser, Thr, Trp, Tyr, or Val;     -   (k) H98 is Thr, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Met,         Phe Pro, Ser, Thr, Trp, Tyr, or Val;     -   (l) H99 is Ser, Ala, Gly, Phe, or Pro;     -   (m) H100 is Leu, Arg, His, Ile, Leu, Lys, Phe, Pro, Trp, Tyr, or         Val;     -   (n) H100A is Ser, Ala, Arg, Asn Asp, Gln, Glu, His, Leu, Lys,         Met, Phe Pro, Ser, Thr, or Trp;     -   (o) L29 is Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met,         Phe Pro, Ser, Thr, Trp, Tyr, or Val;     -   (p) L31 is Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu, Lys, Met,         Phe Pro, Ser, Thr, Trp, Tyr, or Val;     -   (q) L91 is Tyr or Arg;     -   (r) L95A is Ser, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu,         Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val;     -   (s) L95B is Ser, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu,         Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val; and     -   (t) L95C is Ser, Ala, Arg, Asn Asp, Gln, Glu, Gly, His, Leu,         Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or Val;     -   and optionally comprises (u) L93 is Tyr, Ala, Arg, Asn Asp, Gln,         Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, or         Val; and     -   (v) L96 is Gly or Asn.         Among these residues, H47 is a framework residue; all others are         CDR residues.

When a more stringent substitution criterion is imposed—substitution must result in <−0.5 kcal/mol affinity, meaning that the substitution must have a positive (neutral/stabilizing) effect—contact residues are as follows (numbering according to Kabat) (Table 29A, col. 5):

-   -   (a) H33 is Ala or Val;     -   (b) H47 is Trp;     -   (c) H50 is Ala;     -   (d) H51 is Ile;     -   (e) H52 is Ser, Arg, Lys, Phe, or Tyr;     -   (f) H56 is Ser, Arg, or Lys;     -   (g) H58 is Tyr;     -   (h) H95 is Leu;     -   (i) H96 is Gly, Ala, Arg, Asn, Lys, Pro, Ser, or Val;     -   (j) H97 is Ala;     -   (k) H98 is Thr, His, Ile, Leu, Met, Phe, or Tyr;     -   (l) H99 is Ser;     -   (m) H100 is Leu, Phe, Trp, or Tyr;     -   (n) H100A is Ser, Arg, Asn, Gln, Glu His, Leu, Lys, Met, Phe,         Pro, or Trp;     -   (o) L29 is Ala;     -   (p) L31 is Tyr;     -   (q) L91 is Tyr;     -   (r) L95A is Ser, Phe, Trp, or Tyr;     -   (s) L95B is Gly; and     -   (t) L95C is Ser, Arg, Asn, Gln, Glu, Ile, Leu, Lys, Met, Phe,         Trp, Tyr, or Val;     -   and optionally: (u) L93 is Ser; and     -   (v) L96 is Gly.

Alternatively or in addition, the selection of acceptable substitutions can be based on column 6 of Table 29A, where top 3 residues are selected based on their impact on affinity (i.e., top 3 predicted sites with the most stabilizing effect on affinity). Under this criteria, contact residues are as follows (numbering according to Kabat):

-   -   (a) H33 is Ala, Val, His, or Phe;     -   (b) H47 is Trp or Tyr;     -   (c) H50 is Ala, Thr, Ser, or Phe;     -   (d) H51 is Ile, Arg, Lys, or Pro;     -   (e) H52 is Ser, Phe, Arg, or Tyr;     -   (f) H56 is Ser, Lys, Tyr, or Phe;     -   (g) H58 is Tyr;     -   (h) H95 is Leu, Ile, Gln, or Phe;     -   (i) H96 is Gly, Arg, Asn, or Lys;     -   (j) H97 is Ala, Leu, Tyr, or Ile;     -   (k) H98 is Thr, Tyr, Phe, or His;     -   (l) H99 is Ser, Pro, Ala, or Phe;     -   (m) H100 is Leu, Tyr, Trp, or Phe;     -   (n) H100A is Ser, Arg, Leu, or Trp;     -   (o) L29 is Ala, Glu, Asp, or Gln;     -   (p) L31 is Tyr, Glu, Asp, or Trp;     -   (q) L91 is Ty or Arg;     -   (r) L95A is Ser, Phe, Tyr, or His;     -   (s) L95B is Gly, Glu, Asp, or Pro; and     -   (t) L95C is Ser, Trp, Tyr, or Phe;     -   and optionally: (u) L93 is Ser, Glu, Asp, or His;     -   (v) L96 is Gly or Asn.

Paratope residues of TFPI-23 (and variants) may also refer to residues participating in a hydrogen bond with a residue of TFPI, or with a water molecule that is also hydrogen bonded to TFPI, and include the following: H58 Tyr, H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu, L29 Ala, L31 Tyr, and L95B GI (numbering according to Kabat). See, Table 29B.

Paratope residues of TFPI-23 (and variants) may also refer to residues having a non-zero change in BSA due to interaction with TFPI, and include the following (numbering according to Kabat): H33 Ala, H58 Tyr, H95 Leu, H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu, H100A Ser, L29 Ala, L31 Tyr, L91 Tyr, L93 Ser, L95A Ser, and L95B Gly. A cutoff (BSA of 20 Å² or greater, or involved in electrostatic interaction) is applied to avoid inclusion of residues that have minimal interactions. See Table 29B.

If no cutoff of BSA is applied, paratope residues include the following: H33 Ala, H34 Met, H47 Trp, H50 Ala, H51 Ile, H52 Ser, H56 Ser, H58 Tyr; H95 Leu, H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu, H100A Ser, L28 Gly, L29 Ala, L31 Tyr, L91 Tyr, L93 Ser, L94 Ser, L95A Ser, L95B Gly, L95C Ser, and L96 Gly. See Table 29C.

An antibody or antigen-binding fragment thereof of the invention may bind to the same epitope or domain of TFPI as the antibodies that are specifically exemplified herein. For example, an antibody or antigen-binding fragment thereof may be identified by comparing their binding to TFPI with that of TFPI-23 or germlined variants (e.g., TFPI-106 and TFPI-107); or by comparing the function of these antibodies with TFPI-23 and its variants. Analyses and assays that may be used for the purpose of such identification include assays assessing the competitions for binding of TFPI and are exemplified in the Examples.

In one embodiment, an antibody or antigen-binding fragment thereof of the invention may bind to the same epitope or region as the antibodies described herein, such as TFPI-23 and its variants. This may include it being in contact with a particular TFPI residue as described above. For example, an antibody or antigen-binding fragment of the invention may bind to TFPI in such a way that it is in contact (within 4 Å) with a residue selected from the group consisting of: Asp102, Gly104, Ile105, Cys106, Arg107, Gly108, Arg112, Tyr127, Gly129, Cys130, Leu131, Gly132, Met134, Glu138 (according to the numbering of SEQ ID NO: 2), and any combination thereof. An antibody or antigen-binding fragment of the invention may be capable of binding an epitope comprising one or more residues selected from the group consisting of Asp102, Gly104, Ile105, Cys106, Arg107, Gly108, Arg112, Tyr127, Gly129, Cys130, Leu131, Gly132, Met134, Glu138 (according to the numbering of SEQ ID NO: 2), and any combination thereof.

An antibody antigen-binding fragment thereof can comprise at least one paratope residue (numbering according to Kabat) which is within 4.0 Å of at least one epitope residue on TFPI (numbering according to SEQ ID NO:2), as follows: epitope residue 102 Asp is within 4.0 Å of paratope residue H58 Tyr; epitope residue 104 Gly is within 4.0 Å of paratope residue H58 Tyr; epitope residue 105 Ile is within 4.0 Å of paratope residues H33 Ala, H50 Ala, H51 Ile, H52 Ser, H56 Ser, H58 Tyr, H95 Leu; epitope residue 106 Cys is within 4.0 Å of paratope residues H100 Leu, H100A Ser; epitope residue 107 Arg is within 4.0 Å of paratope residue H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu; epitope residue 108 Gly is within 4.0 Å of paratope residue H100 Leu; epitope residue 112 Arg is within 4.0 Å of paratope residue L29 Ala, L31 Tyr; epitope residue 127 Tyr is within 4.0 Å of paratope residue L31 Tyr; epitope residue 129 Gly is within 4.0 Å of paratope residue L31 Tyr; epitope residue 130 Cys is within 4.0 Å of paratope residue L91 Tyr, L95B Gly; epitope residue 131 Leu is within 4.0 Å of paratope residue H47 Trp, H50 Ala, H58 Tyr, L95A Ser, L95B Gly, L95C Ser; epitope residue 132 Gly is within 4.0 Å of paratope residue H58 Tyr, L95A Ser; H58 Tyr, L95A Ser; epitope residue 134 Met is within 4.0 Å of paratope residue L95A Ser; and epitope residue 138 Glu is within 4.0 Å of paratope residue L29 Ala. See Tables 29A and 29B

An antibody or an antigen-binding fragment thereof can also comprise at least one paratope residue (numbering according to Kabat) which can form a hydrogen bond with an epitope residue of TFIP (numbering according to SEQ ID NO:2) as follows: epitope residue 102 Asp can form a hydrogen bond with paratope residue H58 Tyr; epitope residue 107 Arg can form a hydrogen bond with at least one paratope residue selected from the group consisting of H96 Gly, H97 Ala, H98 Thr, H99 Ser, and H100 Leu; epitope residue 112 Arg can form a hydrogen bond with paratope residue L29 Ala; epitope residue 127 Tyr can form a hydrogen bond with paratope residue L31 Tyr; and epitope residue 131 Leu can form a hydrogen bond with paratope residue L95B Gly. See Table 29B.

An antibody or an antigen-binding fragment thereof can also comprise at least one paratope residue (numbering according to Kabat) having a non-zero change in BSA due to interaction with an epitope residue (numbering according to SEQ ID NO:2) as follows: epitope residue 102 Asp interacts with paratope residue H58 Tyr; epitope residue 104 Gly interacts with paratope residue H58 Tyr; epitope residue 105 Ile interacts with at least one paratope residue selected from the group consisting of H33 Ala, H34 Met, H50 Ala, H51 Ile, H52 Ser, H56 Ser, H58 Tyr, and H95 Leu; epitope residue 106 Cys interacts with at least one paratope residue selected from the group consisting of H95 Leu, H100 Leu, H100A Ser, and L91 Tyr; epitope residue 107 Arg interacts with at least one paratope residue selected from the group consisting of H96 Gly, H97 Ala, H98 Thr, H99 Ser, and H100 Leu; epitope residue 108 Gly interacts with paratope residue H100 Leu; epitope residue 112 Arg interacts with at least one paratope residue selected from the group consisting of L29 Ala, L31 Tyr, and L93 Ser; epitope residue 127 Tyr interacts with at least one paratope residue selected from the group consisting of L31 Tyr, and L95B Gly; epitope residue 129 Gly interacts with at least one paratope residue selected from the group consisting of H100A Ser, L31 Tyr, and L91 Tyr; epitope residue 130 Cys interacts with at least one paratope residue selected from the group consisting of H95 Leu, H100A Ser, L31 Tyr, L91 Tyr, and L95B Gly; epitope residue 131 Leu interacts with at least one paratope residue selected from the group consisting of H47 Trp, H50 Ala, H58 Tyr, H95 Leu, L31 Tyr, L91 Tyr, L95A Ser, L95B Gly, L95C Ser, and L96 Gly; epitope residue 132 Gly interacts with at least one paratope residue selected from the group consisting of H58 Tyr, and L95A Ser; epitope residue 133 Asn interacts with paratope residue L95A Ser; epitope residue 134 Met interacts with at least one paratope residue selected from the group consisting of L93 Ser, L94 Ser, and L95A Ser; and epitope residue 138 Glu interacts with at least one paratope residue selected from the group consisting of L28 Gly, L29 Ala, and L93 Ser.

An antibody or an antigen-binding fragment thereof of the invention can be any antibody or antigen-binding fragment that comprises any of the paratope residues above which interacts with at least one epitope residue listed above.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises at least 1, at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, or all of paratope residues described above, or any combination of the various categories of paratope residues described above. Further, conservative substitutions may be introduced to these paratope residues. For example, the antibody or antigen binding fragment thereof may comprise 1, 2, 3, 4, 5, 6, 7, or 8 conservative substitutions according to Table 34.

TABLE 34 Conservative Substitutions Conservative Conservative Residue substitution Residue substitution Ala Ser Leu Ile, Val Arg Lys Lys Arg, Gln Asn Gln; His Met Leu, Ile Asp Glu Phe Met, Leu, Tyr Cys Ser Ser Thr; Gly Gln Asn Thr Ser, Val Glu Asp Trp Tyr Gly Pro Tyr Trp, Phe His Asn, Gln Val Ile, Leu Ile Leu, Val Pro —

An antibody of the invention may have the ability to compete with another antibody for binding to TFPI as described herein. For example, an antibody of the invention may cross-compete with TFPI-23 and its variants thereof described herein for binding to TFPI, or to a suitable fragment or variant of TFPI that is bound by the TFPI-23 antibodies. Such cross-competing antibodies can be identified based on their ability to cross-compete with an exemplified antibody of the invention in standard binding assays. For example, SPR (e.g., by using a Biacore™ system), ELISA assays or flow cytometry may be used to demonstrate cross-competition. Such cross-competition may suggest that the two antibodies bind to identical, overlapping or similar epitopes.

An antibody of the invention may therefore be identified by a method that comprises a binding assay which assesses whether or not a test antibody is able to compete with an exemplified antibody of the invention (such as TFPI-23, or any variant or fragment thereof as described herein) for a binding site on the target molecule.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises the following heavy chain CDR sequences: (i) CDR-H1 comprising SEQ ID NO: 38, CDR-H2 comprising SEQ ID NO: 39, and CDR-H3 comprising SEQ ID NO: 40; and/or (ii) the following light chain CDR sequences: CDR-L1 comprising SEQ ID NO: 33, CDR-L2 comprising SEQ ID NO: 34, and CDR-L3 comprising SEQ ID NO: 35. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises following heavy chain CDR sequences: (i) a CDR-H1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 38, a CDR-H2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 39, and a CDR-H3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 40; and/or (ii) the following light chain CDR sequences: a CDR-L1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 33, a CDR-L2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 34, and a CDR-L3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 35. In certain embodiments, no more than 10, no more than 9, no more than 8, no more than 7, no more than 6, no more than 5, no more than 4, no more than 3, no more than 3, no more than 2, or no more than one substitution is made in each CDR, relative to SEQ ID NOs. 38, 39, 40, 33, 34, and 35, respectively. In certain embodiments, the substitution is a conservative substation according to Table 34. In certain embodiments, the substitution is according to Table 29A, column 4, column 5, or column 6.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises a human framework sequence. For example, heavy chain framework sequence can be from a human VH3 germline, a VH1 germline, a VH5 germline, or a VH4 germline. Preferred human germline heavy chain frameworks are frameworks derived from VH1, VH3, or VH5 germlines. For example, VH frameworks from the following germlines may be used: IGHV3-23, IGHV3-7, or IGHV1-69 (germline names are based on IMGT germline definition). Preferred human germline light chain frameworks are frameworks derived from VK or Vλ germlines. For example, VL frameworks from the following germlines may be used: IGKV1-39 or IGKV3-20 (germline names are based on IMGT germline definition). Alternatively or in addition, the framework sequence may be a human germline consensus framework sequence, such as the framework of human Vλ1 consensus sequence, VK1 consensus sequence, VK2 consensus sequence, VK3 consensus sequence, VH3 germline consensus sequence, VH1 germline consensus sequence, VH5 germline consensus sequence, or VH4 germline consensus sequence.

Sequences of human germline frameworks are available from various public databases, such as V-base, IMGT, NCBI, or Abysis.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises: (i) a VH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to an amino acid sequence selected from the group consisting of SEQ ID NOs: 41, 63, and 65; and/or (ii) a VL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO:36. Any combination of these VL and VH sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises: (i) a CH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 20; and/or (ii) a CL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 26. Any combination of these CH and CL sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises an Fc domain. The Fc domain can be derived from IgA (e.g., IgA₁ or IgA₂), IgG, IgE, or IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises: (i) a heavy chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 42, SEQ ID NO: 64, or SEQ ID NO: 66; and/or (ii) a light chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 37. Any combination of these heavy chain and light chain sequences is also encompassed by the invention.

TFPI-24 and Variants

The co-crystal structures show that TFPI-24 (and its variants) share a number of epitope residues with TFPI-23. Among these, Ile105, Arg107, and Leu131 (according to the numbering of human TFPI, as shown in SEQ ID NO: 2) are believed to be important for antibody-antigen interaction. Other shared epitope residues include: Cys106, Gly108, C130, L131, and G132, (according to the numbering of SEQ ID NO: 2).

Epitope residues that are specific for TFPI-24 (and its variants) include: Glu100, Glu101, Asp102, Gly104, and Tyr109. TFPI-23 and its variants do not bind to these residues. See Table 27. Accordingly, the invention provides an isolated antibody, or antigen-binding fragment thereof, that specifically binds to an epitope in K2 of TFPI, wherein said epitope (i) comprises residues Ile105, Arg107, and Leu131; (ii) optionally comprises one or more residues selected from the group consisting of: Cys106, Gly108, Cys130, Leu131, and Gly132; and (iii) further optionally comprises one or more residues selected from the group consisting of: Glu100, Glu101, Asp102, Gly104, and Tyr109 (according to the numbering of SEQ ID NO: 2).

In certain embodiments, the epitope does not comprise one or more residues selected from the group consisting of: P103, T111, Y113, F114, N116, Q118, Q121, C122, E123, R124, F125, K126, L140 (numbering according to SEQ ID NO: 2), and any combination thereof. See, Table 27. According to WO201007269 (Novo Nordisk), reference antibody 4F36 recognizes an epitope comprising P103, T111, Y113, F114, N116, Q118, Q121, C122, E123, R124, F125, K126, and L140.

In certain embodiments, the epitope does not comprise one or more residues selected from the group consisting of: D31, D32, P34, C35, K36, P103, K126, Y127, G128 (numbering according to SEQ ID NO: 2), and any combination thereof. See, Table 27. According to Table 27, reference antibodies 2A8 and 2A8-200 recognize an epitope comprising D31, D32, P34, C35, K36, P103, K126, Y127, and G128.

Paratope residues from TFPI-24 (based on BSA) have also been characterized (see Table 24) and include the following: H33 Ala, H35 Gln, H52 Ser, H53 Asn, H55 Arg, H56 Ser, H95 Phe, H96 Leu, H97 His, H99 Ser, H101 Asp, L31 Met, L32 Tyr, L34 His, L36 Tyr, L50 Arg, L91 Trp, and L96 Tyr. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, at least 14, at least 15, at least 16, at least 17, or all of these paratope residues. Further, conservative substitutions may be introduced to these paratope residues. For example, the antibody or antigen binding fragment thereof may comprise 1, 2, 3, 4, 5, 6, 7, or 8 conservative substitutions according to Table 34.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises the following heavy chain CDR sequences: (i) CDR-H1 comprising SEQ ID NO: 48, CDR-H2 comprising SEQ ID NO: 49, and CDR-H3 comprising SEQ ID NO: 50; and/or (ii) the following light chain CDR sequences: CDR-L1 comprising SEQ ID NO: 43, CDR-L2 comprising SEQ ID NO: 44, and CDR-L3 comprising SEQ ID NO: 45. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises following heavy chain CDR sequences: (i) a CDR-H1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 48, a CDR-H2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 49, and a CDR-H3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 50; and/or (ii) the following light chain CDR sequences: a CDR-L1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 43, a CDR-L2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 44, and a CDR-L3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 45. In certain embodiments, no more than 10, no more than 9, no more than 8, no more than 7, no more than 6, no more than 5, no more than 4, no more than 3, no more than 3, no more than 2, or no more than one substitution is made in each CDR, relative to SEQ ID NOs. 48, 49, 50, 43, 44, and 45, respectively. In certain embodiments, the substitution is a conservative substation according to Table 34.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises a human framework sequence. For example, heavy chain framework sequence can be from a human VH3 germline, a VH1 germline, a VH5 germline, or a VH4 germline, as described above. Preferred human germline light chain frameworks are frameworks derived from VK or Vλ germlines, as described above. Consensus human germline framework sequences may also be used as described above.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a VH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to an amino acid sequence selected from the group consisting of SEQ ID NOs: 67, 69, 51, and 79; and/or (ii) a VL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to an amino acid sequence selected from the group consisting of SEQ ID NOs: 46, 71, 73, 75, and 77. Any combination of these VL and VH sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises: (i) a CH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 20; and/or (ii) a CL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 26. Any combination of these CH and CL sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises an Fc domain. The Fc domain can be derived from IgA (e.g., IgA₁ or IgA₂), IgG, IgE, or IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises: (i) a heavy chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 52, SEQ ID NO: 68, SEQ ID NO: 70, or SEQ ID NO: 80; and/or (ii) a light chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 47, SEQ ID NO: 72, SEQ ID NO: 74, SEQ ID NO: 76, or SEQ ID NO: 78. Any combination of these heavy chain and light chain sequences is also encompassed by the invention.

4D8 and Variants

Co-crystal structures also reveal the epitope and paratope information for antibody 4D8 and variants. Epitope residues for 4D8 and its variants include: Glu101, Pro103, Tyr109, Thr111, Ser119, Gln121, Glu123, Arg124, Lys126, and Leu140, according to the numbering of SEQ ID NO: 2.

In certain embodiments, the epitope does not comprise one or more residues selected from the group consisting of: E100, D102, R107, Y113, F114, N116, Q118, C122 (numbering according to SEQ ID NO: 2), and any combination thereof. See, Table 27. According to WO201007269 (Novo Nordisk), reference antibody 4F36 recognizes an epitope comprising E100, D102, R107, Y113, F114, N116, Q118, and C122.

In certain embodiments, the epitope does not comprise one or more residues selected from the group consisting of: D31, D32, P34, C35, K36, E100, 1105, R107, G108, Y127, G128 (numbering according to SEQ ID NO: 2), and any combination thereof. See, Table 27. According to Table 27, reference antibodies 2A8 and 2A8-200 recognize an epitope comprising D31, D32, P34, C35, K36, E100, 1105, R107, G108, Y127, and G128.

Paratope residues from 4D8 (based on BSA) have also been characterized (see Table 20) and include the following: H50 Asp, H57 Thr, H58 Leu, H59 Tyr, H61 Gln, H98 Asp, H99 Tyr, H100 Asp, L30 His, L50 Trp, L92 Tyr, L93 Thr, L94 Thr, and L96 Tyr. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises at least 8, at least 9, at least 10, at least 11, at least 12, at least 13, or all of these paratope residues. Further, conservative substitutions may be introduced to these paratope residues. For example, the antibody or antigen binding fragment thereof may comprise 1, 2, 3, 4, 5, 6, 7, or 8 conservative substitutions according to Table 34.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises the following heavy chain CDR sequences: (i) CDR-H1 comprising SEQ ID NO: 87, CDR-H2 comprising SEQ ID NO: 88, and CDR-H3 comprising SEQ ID NO: 89; and/or (ii) the following light chain CDR sequences: CDR-L1 comprising SEQ ID NO: 81, CDR-L2 comprising SEQ ID NO: 82, and CDR-L3 comprising SEQ ID NO: 83. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises following heavy chain CDR sequences: (i) a CDR-H1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 87, a CDR-H2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 88, and a CDR-H3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 89; and/or (ii) the following light chain CDR sequences: a CDR-L1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 81, a CDR-L2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 82, and a CDR-L3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 83. In certain embodiments, no more than 10, no more than 9, no more than 8, no more than 7, no more than 6, no more than 5, no more than 4, no more than 3, no more than 3, no more than 2, or no more than one substitution is made in each CDR, relative to SEQ ID NOs. 87, 88, 89, 81, 82, and 83, respectively. In certain embodiments, the substitution is a conservative substation according to Table 34.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises a human framework sequence. For example, heavy chain framework sequence can be from a human VH3 germline, a VH1 germline, a VH5 germline, or a VH4 germline, as described above. Preferred human germline light chain frameworks are frameworks derived from VK or Vλ germlines, as described above. Consensus human germline framework sequences may also be used as described above.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a VH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to an amino acid sequence selected from the group consisting of SEQ ID NOs: 90, 95, 97, 99, 101, 103, 105, and 107; and/or (ii) a VL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to an amino acid sequence selected from the group consisting of SEQ ID NOs: 84, 109, and 111. Any combination of these VL and VH sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a CH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 20, and/or (ii) a CL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 91 or SEQ ID NO: 85. Any combination of these CH and CL sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises an Fc domain. The Fc domain can be derived from IgA (e.g., IgA₁ or IgA₂), IgG, IgE, or IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a heavy chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 92, SEQ ID NO: 94, SEQ ID NO: 96, SEQ ID NO: 98, SEQ ID NO: 100, SEQ ID NO: 102, SEQ ID NO: 104, SEQ ID NO: 106, SEQ ID NO: 108; and/or (ii) a light chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 86, SEQ ID NO: 93, SEQ ID NO: 110, or SEQ ID NO: 112. Any combination of these heavy chain and light chain sequences is also encompassed by the invention.

TFPI-3 and Variants

Also provided herein are TFPI-3 and its variants. Accordingly, the antibody or antigen-binding fragment thereof based on TFPI-3 comprises the following heavy chain CDR sequences: (i) CDR-H1 comprising SEQ ID NO: 16, CDR-H2 comprising SEQ ID NO: 17, and CDR-H3 comprising SEQ ID NO: 18; and/or (ii) the following light chain CDR sequences: CDR-L1 comprising SEQ ID NO: 10, CDR-L2 comprising SEQ ID NO: 11, and CDR-L3 comprising SEQ ID NO: 12. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises following heavy chain CDR sequences: (i) a CDR-H1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 16, a CDR-H2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 17, and a CDR-H3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 18; and/or (ii) the following light chain CDR sequences: a CDR-L1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 10, a CDR-L2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 11, and a CDR-L3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 12. In certain embodiments, no more than 10, no more than 9, no more than 8, no more than 7, no more than 6, no more than 5, no more than 4, no more than 3, no more than 3, no more than 2, or no more than one substitution is made in each CDR, relative to SEQ ID NOs. 16, 17, 18, 10, 11, and 12, respectively. In certain embodiments, the substitution is a conservative substation according to Table 34.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises a human framework sequence. For example, heavy chain framework sequence can be from a human VH3 germline, a VH1 germline, a VH5 germline, or a VH4 germline, as described above. Preferred human germline light chain frameworks are frameworks derived from VK or Vλ germlines, as described above. Consensus human germline framework sequences may also be used as described above.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a VH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 19, and/or (ii) a VL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 13. Any combination of these VL and VH sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a CH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 20; and/or (ii) a CL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 91 or SEQ ID NO: 14. Any combination of these CH and CL sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises an Fc domain. The Fc domain can be derived from IgA (e.g., IgA₁ or IgA₂), IgG, IgE, or IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a heavy chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 21; and/or (ii) a light chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 15. Any combination of these heavy chain and light chain sequences is also encompassed by the invention.

TFPI-21 and Variants

Also provided herein are TFPI-21 and its variants. Accordingly, the antibody or antigen-binding fragment thereof based on TFPI-21 comprises the following heavy chain CDR sequences: (i) CDR-H1 comprising SEQ ID NO: 28, CDR-H2 comprising SEQ ID NO: 29, and CDR-H3 comprising SEQ ID NO: 30; and/or (ii) the following light chain CDR sequences: CDR-L1 comprising SEQ ID NO: 22, CDR-L2 comprising SEQ ID NO: 23, and CDR-L3 comprising SEQ ID NO: 24. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises following heavy chain CDR sequences: (i) a CDR-H1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 28, a CDR-H2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 29, and a CDR-H3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 30; and/or (ii) the following light chain CDR sequences: a CDR-L1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 22, a CDR-L2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 23, and a CDR-L3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 24. In certain embodiments, no more than 10, no more than 9, no more than 8, no more than 7, no more than 6, no more than 5, no more than 4, no more than 3, no more than 3, no more than 2, or no more than one substitution is made in each CDR, relative to SEQ ID NOs. 28, 29, 30, 22, 23, and 24, respectively. In certain embodiments, the substitution is a conservative substation according to Table 34.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises a human framework sequence. For example, heavy chain framework sequence can be from a human VH3 germline, a VH1 germline, a VH5 germline, or a VH4 germline, as described above. Preferred human germline light chain frameworks are frameworks derived from VK or Vλ germlines, as described above. Consensus human germline framework sequences may also be used as described above.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a VH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 31, and/or (ii) a VL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 25. Any combination of these VL and VH sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a CH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 20; and/or (ii) a CL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 91 or SEQ ID NO: 26. Any combination of these CH and CL sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises an Fc domain. The Fc domain can be derived from IgA (e.g., IgA₁ or IgA₂), IgG, IgE, or IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a heavy chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 32, and/or (ii) a light chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 27. Any combination of these heavy chain and light chain sequences is also encompassed by the invention.

TFPI-26 and Variants

Also provided herein are TFPI-26 and its variants. Accordingly, the antibody or antigen-binding fragment thereof based on TFPI-26 comprises the following heavy chain CDR sequences: (i) CDR-H1 comprising SEQ ID NO: 58, CDR-H2 comprising SEQ ID NO: 59, and CDR-H3 comprising SEQ ID NO: 60; and/or (ii) the following light chain CDR sequences: CDR-L1 comprising SEQ ID NO: 53, CDR-L2 comprising SEQ ID NO: 54, and CDR-L3 comprising SEQ ID NO: 55. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises following heavy chain CDR sequences: (i) a CDR-H1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 58, a CDR-H2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 59, and a CDR-H3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 60; and/or (ii) the following light chain CDR sequences: a CDR-L1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 53, a CDR-L2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 54, and a CDR-L3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 55. In certain embodiments, no more than 10, no more than 9, no more than 8, no more than 7, no more than 6, no more than 5, no more than 4, no more than 3, no more than 3, no more than 2, or no more than one substitution is made in each CDR, relative to SEQ ID NOs. 58, 59, 60, 53, 54, and 55, respectively. In certain embodiments, the substitution is a conservative substation according to Table 34.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises a human framework sequence. For example, heavy chain framework sequence can be from a human VH3 germline, a VH1 germline, a VH5 germline, or a VH4 germline, as described above. Preferred human germline light chain frameworks are frameworks derived from VK or Vλ germlines, as described above. Consensus human germline framework sequences may also be used as described above.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a VH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 61, and/or (ii) a VL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 56. Any combination of these VL and VH sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a CH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 20; and/or (ii) a CL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 26. Any combination of these CH and CL sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises an Fc domain. The Fc domain can be derived from IgA (e.g., IgA₁ or IgA₂), IgG, IgE, or IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a heavy chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 62; and/or (ii) a light chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 57. Any combination of these heavy chain and light chain sequences is also encompassed by the invention.

6B7.c5 and Variants

Also provided herein are 6B7.c5 and its variants. Accordingly, the antibody or antigen-binding fragment thereof based on 6B7.c5 comprises the following heavy chain CDR sequences: (i) CDR-H1 comprising SEQ ID NO: 118, CDR-H2 comprising SEQ ID NO: 119, and CDR-H3 comprising SEQ ID NO: 120; and/or (ii) the following light chain CDR sequences: CDR-L1 comprising SEQ ID NO: 113, CDR-L2 comprising SEQ ID NO: 114, and CDR-L3 comprising SEQ ID NO: 115. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises following heavy chain CDR sequences: (i) a CDR-H1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 118, a CDR-H2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 119, and a CDR-H3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 120; and/or (ii) the following light chain CDR sequences: a CDR-L1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 113, a CDR-L2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 114, and a CDR-L3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 115. In certain embodiments, no more than 10, no more than 9, no more than 8, no more than 7, no more than 6, no more than 5, no more than 4, no more than 3, no more than 3, no more than 2, or no more than one substitution is made in each CDR, relative to SEQ ID NOs. 118, 119, 120, 113, 114, and 115, respectively. In certain embodiments, the substitution is a conservative substation according to Table 34.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises a human framework sequence. For example, heavy chain framework sequence can be from a human VH3 germline, a VH1 germline, a VH5 germline, or a VH4 germline, as described above. Preferred human germline light chain frameworks are frameworks derived from VK or Vλ germlines, as described above. Consensus human germline framework sequences may also be used as described above.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a VH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 121, and/or (ii) a VL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 116. Any combination of these VL and VH sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a CH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 91, and/or (ii) a CL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 91 or SEQ ID NO: 85. Any combination of these CH and CL sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises an Fc domain. The Fc domain can be derived from IgA (e.g., IgA₁ or IgA₂), IgG, IgE, or IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a heavy chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 122; and/or (ii) a light chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 117. Any combination of these heavy chain and light chain sequences is also encompassed by the invention.

7A4.D9 and Variants

Also provided herein are TFPI-3 and its variants. Accordingly, the antibody or antigen-binding fragment thereof based on TFPI-3 comprises the following heavy chain CDR sequences: (i) CDR-H1 comprising SEQ ID NO: 128, CDR-H2 comprising SEQ ID NO: 129, and CDR-H3 comprising SEQ ID NO: 130; and/or (ii) the following light chain CDR sequences: CDR-L1 comprising SEQ ID NO: 123, CDR-L2 comprising SEQ ID NO: 124, and CDR-L3 comprising SEQ ID NO: 125. In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises following heavy chain CDR sequences: (i) a CDR-H1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 128, a CDR-H2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 129, and a CDR-H3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 130; and/or (ii) the following light chain CDR sequences: a CDR-L1 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 123, a CDR-L2 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 124, and a CDR-L3 at least 85%, at least 90%, or at least 95% identical to SEQ ID NO: 125. In certain embodiments, no more than 10, no more than 9, no more than 8, no more than 7, no more than 6, no more than 5, no more than 4, no more than 3, no more than 3, no more than 2, or no more than one substitution is made in each CDR, relative to SEQ ID NOs. 128, 129, 130, 123, 124, and 125, respectively. In certain embodiments, the substitution is a conservative substation according to Table 34.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises a human framework sequence. For example, heavy chain framework sequence can be from a human VH3 germline, a VH1 germline, a VH5 germline, or a VH4 germline, as described above. Preferred human germline light chain frameworks are frameworks derived from VK or Vλ germlines, as described above. Consensus human germline framework sequences may also be used as described above.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a VH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 131, and/or (ii) a VL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 126. Any combination of these VL and VH sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a CH comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 91; and/or (ii) a CL comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 91 or SEQ ID NO: 85. Any combination of these CH and CL sequences is also encompassed by the invention.

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises an Fc domain. The Fc domain can be derived from IgA (e.g., IgA₁ or IgA₂), IgG, IgE, or IgG (e.g., IgG₁, IgG₂, IgG₃, or IgG₄).

In certain embodiments, the antibody or antigen-binding fragment thereof described herein comprises (i) a heavy chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 132; and/or (ii) a light chain comprising an amino acid sequence that is at least 50%, at least 60%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identical to SEQ ID NO: 127. Any combination of these heavy chain and light chain sequences is also encompassed by the invention.

Also disclosed is an antibody, or antigen-binding fragment thereof, that specifically binds to the K2 Domain of TFPI, and competes for binding to TFPI with any of the antibody or antigen-binding fragment thereof described herein, such as any one of the antibodies listed in Table 3 (or antigen-binding fragment thereof). For example, if the binding of an antibody, or an antigen-binding portion thereof, to TFPI hinders the subsequent binding to TFPI by TFPI-23 or TFPI-106, the antibody or an antigen-binding portion thereof competes with TFPI-23 or TFPI-106 for TFPI binding.

Also disclosed is an antibody, or antigen-binding fragment thereof, that specifically binds to the K2 Domain of TFPI, and binds to the same TFPI epitope as any of the antibody or antigen-binding fragment thereof described herein, such as any one of the antibodies listed in Table 3 or antigen-binding fragment thereof.

An exemplary antibody competition assay (and overlapping epitope analysis) by SPR is provided in Example 6.

The antibodies and antigen-binding fragments disclosed herein include monoclonal antibodies, polyclonal antibodies, antibody fragments (e.g., Fab, Fab′, F(ab)₂, Fv, Fc, etc.), chimeric antibodies, bispecific antibodies, heteroconjugate antibodies, single chain (ScFv), mutants thereof, fusion proteins comprising an antibody portion, domain antibodies (dAbs), humanized antibodies, and any other modified configuration of the immunoglobulin molecule that comprises an antigen recognition site of the required specificity, including glycosylation variants of antibodies, amino acid sequence variants of antibodies, and covalently modified antibodies. The antibodies and antigen-binding fragments may be murine, rat, human, or any other origin (including chimeric or humanized antibodies). In some embodiments, the antibody is a monoclonal antibody. In some embodiments, the antibody is a chimeric, humanized or human antibody. In certain embodiments, the antibody is a human antibody. In certain embodiments, the antibody is a humanized antibody.

In certain embodiments, the antibody or antigen-binding fragment thereof disclosed herein has an affinity (Kd) value of no more than about 1×10⁻³M, such as no more than about 5×10⁻⁴M, no more than about 4×10⁻⁴ M, no more than about 3×10⁻⁴ M, no more than about 2×10⁻⁴ M, no more than about 1×10⁻⁴ M, no more than about 9×10⁻⁵ M, no more than about 8×10⁻⁵ M, no more than about 7×10⁻⁵ M, no more than about 6×10⁻⁵M, no more than about 5×10⁻⁵M, no more than about 4×10⁻⁵ M, no more than about 3×10⁻⁵ M, no more than about 2×10⁻⁵ M, no more than about 1×10⁻⁵M, no more than about 9×10⁻⁶M, no more than about 8×10⁻⁶ M, no more than about 7×10⁻⁶M, no more than about 6×10⁻⁶ M, no more than about 5×10⁻⁶ M, no more than about 4×10⁻⁶ M, no more than about 3×10⁻⁶ M, no more than about 2×10⁻⁶M, no more than about 1×10⁻⁶M, no more than about 9×10⁻⁷M, no more than about 8×10⁻⁷M, no more than about 7×10⁻⁷M, no more than about 6×10⁻⁷M, no more than about 5×10⁻⁷M, no more than about 4×10⁻⁷M, no more than about 3×10⁻⁷M, no more than about 2×10⁻⁷ M, no more than about 1×10⁻⁷ M, no more than about 9×10⁻⁸ M, no more than about 8×10⁻⁸M, no more than about 7×10⁻⁸M, no more than about 6×10⁻⁸M, no more than about 5×10⁻⁸ M, no more than about 4×10⁻⁸ M, no more than about 3×10⁻⁸ M, no more than about 2×10⁻⁸M, no more than about 1×10⁻⁸M, no more than about 9×10⁻⁹ M, no more than about 8×10⁻⁹M, no more than about 7×10⁻⁹ M, no more than about 6×10⁻⁹ M, no more than about 5×10⁻⁹ M, no more than about 4×10⁻⁹ M, no more than about 3×10⁻⁹M, no more than about 2×10⁻⁹M, no more than about 1×10⁻⁹M, from about 1×10⁻³M to about 1×10⁻¹³M, 1×10⁻⁴M to about 1×10⁻¹³M, 1×10⁻⁵M to about 1×10⁻¹³M, from about 1×10⁻⁶M to about 1×10⁻¹³M, from about 1×10⁻⁷M to about 1×10⁻¹³ M, from about 1×10⁻⁸M to about 1×10⁻¹³M, from about 1×10⁻⁹M to about 1×10⁻¹³M, 1×10⁻³M to about 1×10⁻¹² M, 1×10⁻⁴M to about 1×10⁻¹²M, from about 1×10⁻⁵M to about 1×10⁻¹²M, from about 1×10⁻⁶M to about 1×10⁻¹² M, from about 1×10⁻⁷M to about 1×10⁻¹²M, from about 1×10⁻⁸ M to about 1×10⁻¹² M, from about 1×10⁻⁹M to about 1×10⁻¹²M, 1×10⁻³M to about 1×10⁻¹¹M, 1×10⁻⁴M to about 1×10⁻¹¹M, from about 1×10⁻⁵M to about 1×10⁻¹¹M, from about 1×10⁻⁶M to about 1×10⁻¹¹ M, from about 1×10⁻⁷M to about 1×10⁻¹¹ M, from about 1×10⁻⁸M to about 1×10⁻¹¹ M, from about 1×10⁻⁹M to about 1×10⁻¹¹ M, 1×10⁻³M to about 1×10⁻¹⁰ M, 1×10⁻⁴M to about 1×10⁻¹⁰ M, from about 1×10⁻⁵M to about 1×10⁻¹⁰ M, from about 1×10⁻⁶M to about 1×10⁻¹⁰ M, from about 1×10⁻⁷M to about 1×10⁻¹⁰ M from about 1×10⁻⁸M to about 1×10⁻¹⁰ M, or from about 1×10⁻⁹M to about 1×10⁻¹⁰ M.

In certain embodiments, the dissociation constant is measured using surface plasmon resonance (SPR) method (Biacore). Surface plasmon resonance refers to an optical phenomenon that allows for the analysis of real-time biospecific interactions by detection of alterations in protein concentrations within a biosensor matrix, for example using the BIACORE™ system. In certain embodiments, the SPR measurement is conducted using a Biacore T100 or T200 instrument.

For example, a standard assay condition for surface plasmon resonance can be based on ligand immobilization of approximately 100 Response Units (RU) of IgG on the SPR chip. Purified target proteins are diluted in buffer to a range of final concentrations and injected at a requisite flow rate (e.g. 10-100 μl/min) to allow the calculation of Ka. Dissociation is allowed to proceed to establish off-rate (Kd), followed by a 5 sec pulse of 3M MgCl₂ (or 20 mM NaOH) for regeneration of the chip surface. Sensorgrams are then analyzed using a kinetics evaluation software package.

In an exemplary embodiment, the SPR assay is according to the conditions as set forth in Example 1, under the subheading “Surface plasmon resonance (SPR).”

In certain embodiments, the dissociation constant is measured using solution-based kinetic exclusion assay (KinExA™). In a particular embodiment, the KinExA measurement is conducted using a KinExA™ 3200 instrument (Sapidyne). The Kinetic Exclusion Assay (KinExA™) is a general purpose immunoassay platform (basically a flow spectrofluorimeter) that is capable of measuring equilibrium dissociation constants, and association and dissociation rate constants for antigen/antibody interactions. Since KinExA™ is performed after equilibrium has been obtained it is an advantageous technique to use for measuring the Kd of high affinity interactions where the off-rate of the interaction may be very slow. The KinExA™ methodology can be conducted generally as described in Drake et al (2004) Analytical Biochemistry 328, 35-43.

In general, a TFPI antibody needs to bind to TFPI with high affinity, in order to effectively block the activities of TFPI. However, because TFPI is also expressed on cell surface, when the binding affinity of an antibody is too high, the antibody can quickly get internalized and degraded by a host cell. This could potentially result in a short half-life and repeated injections. For example, antibody TFPI-23 shows a lower binding affinity (Kd) as compared to TFPI-24, and under certain circumstances, is more desirable because it has a lower internalization rate and longer half-life. Accordingly, binding affinities (Kd) from 5×10⁻⁷M to about 5×10⁻¹¹ M, in particular from about 1×10⁻⁸ M to about 1×10⁻¹⁰ M (0.1 nM to 10 nM), are generally desirable if longer half-life is desired. This range is believed to strike a balance between (i) binding affinities that are needed for effectively inhibiting the activities of TFPI, and (ii) a longer half-life and reduced antibody internalization.

In particular, it is believed that to maintain weekly subcutaneous dosing at 3 mg/kg, Kd value from about 1×10⁻⁸M to about 1×10⁻¹⁰ M (0.1 nM to 10 nM) is desired.

Whether an antibody or antigen-binding fragment thereof reduces the activity of TFPI, or reduces the binding of TFPI to a physiological substrate (e.g., FXa) can be determined by measuring the decrease in the binding affinity of TFPI to said physiological substrate, for example by comparing (i) the binding affinity of TFPI to its substrate in the presence of the anti-TFPI antibody (or antigen-binding fragment thereof), with (ii) the binding affinity of TFPI to the same substrate in the absence of the anti-TFPI antibody. The reduction in binding of TFPI to a physiological substrate (e.g., FXa) can be at least about 10%, at least about 20%, at least about 30%, at least about 40%, at least about 50%, at least about 60%, at least about 70%, at least about 80%, at least about 90%, at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%, in the presence of the anti-TFPI antibody (or antigen-binding fragment thereof). The expected binding of TFPI to its physiological substrate in the absence of the antibody (or fragment) can be set as 100%.

The TFPI inhibitory activities, also referred to herein as “reducing the activity of TFPI,” of an anti-TFPI antibody or antigen-binding fragment thereof can also be assessed in an in vivo model and/or in vitro using, e.g., plasmatic systems. For example, inhibitory activities (or the level of reducing an activity of TFPI) of an antibody can be assessed by: (i) a decrease in clotting time as measured in a plasma based dilute prothrombin time assay; (ii) a reduction in clotting time in whole blood as measured by thromboelastrography; (iii) an increase in thrombin generation; (iv) an increase in FXa activity in the presence of TFPI; (v) enhanced platelet accumulation in the presence of TFPI; (vi) increased fibrin generation in the presence of TFPI; or (vii) any combination thereof. The inhibitory activities of an antibody or antigen-binding fragment can be dose-dependent (e.g., causing a dose-dependent decrease in clotting time as measured in a plasma based dilute prothrombin time assay).

Several exemplary assays for assessing the TFPI inhibitory activity of an antibody are described in detail in the Examples. For example, the plasma dilute Prothrombin Time (PT) assay is a modified PT assay using diluted thromboplastin or Tissue Factor to prolong the clotting time and dynamic range of the assay. An inhibitory/neutralizing anti-TFPI antibody should decrease the dilute prothrombin time.

Another exemplary model system for determining TFPI-inhibitory activity is the extrinsic tenase assay, which tests the ability of antibody or antigen-binding fragment thereof to restore extrinsic complex-mediated FX activation in the presence of TFPI. Another model system for characterizing TFPI-inhibitory activity is the FXa inhibition assay, wherein FXa activity is measured in the presence of TFPI (see Sprecher et al., Proc. Nat. Acad. Sci. USA 91:3353-3357 (1994)).

The inhibitory activities of an antibody or antigen-binding fragment thereof can also be assessed in a plasma-based assay. Thrombin formation can be triggered in plasma substantially lacking FVIII or FIX activity (e.g., the residual coagulation factor activity is lower than 1%) in the presence of an anti-TFPI antibody or antigen-binding fragment thereof. Thrombin formation can be detected using a fluorogenic or chromogenic substrate. Prothrombin conversion can be measured using, e.g., a Thrombograph™ (Thermo Scientific, Waltham, Mass.), and the resulting data can be compiled into a Calibrated Automatic Thrombogram generated by Thrombinoscope™ software available from Thrombinoscope BV.

For example, an antibody or antigen-binding fragment may improve TFPI-regulated thrombin generation in the absence of FVIII (e.g., in FVIII-depleted plasma) to at least 1% of the level of TFPI-dependent thrombin generation in normal plasma. Generally, normal (unafflicted) plasma contains about 0.5 U/mL to about 2 U/mL Factor VIII. Accordingly, in some instances, an antibody or antigen-binding fragment of the invention will enhance thrombin formation in the absence of FVIII to at least about 1% of that observed in the presence of 0.5 U/mL to 2 U/mL FVIII. In further embodiments, the antibody (or antigen-binding fragment thereof) enhances thrombin formation in the absence of Factor VIII to at least about 2%, at least about 3%, at least about 5%, at least about 7%, or at least about 10% of the level of thrombin formation in normal plasma, i.e., in the presence of physiological levels of Factor VIII.

The antibody or antigen-binding fragment may also be administered to an animal model of thrombin deficiency or hemophilia to characterize TFPI inhibitory activity in vivo. Such in vivo models are known in the art and include for example, mice administered anti-FVIII antibodies to induce hemophilia A (Tranholm et al., Blood, 102, 3615-3620 (2003)); coagulation factor knock-out models such as, but not limited to, FVIII knock-out mice (Bi et al., Nat. Genet., 10(1), 119-121 (1995)) and FIX knock-out mice (Wang et al., Proc. Nat. Acad. Sci. USA 94(21):11563-11566 (1997)); induced hemophilia-A in rabbits (Shen et al., Blood, 42(4):509-521 (1973)); and Chapel Hill HA dogs (Lozier et al., Proc. Nat. Acad. Sci. USA 99:12991-12996 (2002)).

In certain embodiments, the antibodies (or antigen-binding fragments) disclosed herein enhances FXa activity in the presence of TFPI, with a half maximal effective concentration (EC₅₀) of no more than 1×10⁻⁴ M, no more than 1×10⁻⁵ M, no more than 1×10⁻⁶ M, no more than 1×10⁻⁷ M, no more than 1×10⁻⁸ M, no more than 1×10⁻⁹ M, no more than 1×10⁻¹⁰ M, no more than 1×10⁻¹¹ M, or no more than 1×10⁻¹² M. Preferably the EC₅₀ is from about 5×10⁻⁷ M to 1×10⁻¹¹ M, such as from about 1×10⁻⁷ M to 5×10⁻¹⁰ M, from about 1×10⁻⁷ M to 1×10⁻¹⁰ M, 1×10⁻⁷ M to 5×10⁻⁹ M, 5×10⁻⁷ M to 5×10⁻¹⁰ M, from about 5×10⁻⁷ M to 1×10⁻¹⁰ M, or from about 5×10⁻⁷ M to 5×10⁻⁹ M.

In certain embodiments, the antibodies (or antigen-binding fragments) disclosed herein neutralizes the TFPI inhibition of the FVIIa/TF mediated FX activation, with a half maximal effective concentration (EC₅₀) of no more than 1×10⁻⁴ M, no more than 1×10⁻⁵ M, no more than 1×10⁻⁶ M, no more than 1×10⁻⁷ M, no more than 1×10⁻⁸ M, no more than 1×10⁻⁹ M, no more than 1×10⁻¹⁰ M, no more than 1×10⁻¹¹ M, or no more than 1×10⁻¹² M. Preferably the EC₅₀ is from about 5×10⁻⁷ M to 1×10⁻¹¹ M, such as from about 1×10⁻⁷ M to 5×10⁻¹⁰ M, from about 1×10⁻⁷ M to 1×10⁻¹⁰ M, 1×10⁻⁷ M to 5×10⁻⁹ M, 5×10⁻⁷ M to 5×10⁻¹⁰ M, from about 5×10⁻⁷ M to 1×10⁻¹⁰ M, or from about 5×10⁻⁷ M to 5×10⁻⁹ M.

In certain embodiments, the antibodies (or antigen-binding fragments) disclosed herein decreases the clotting time as measured in a plasma based dilute prothrombin time assay, with a half maximal effective concentration (EC₅₀) of no more than 1×10⁻⁴ M, no more than 1×10⁻⁵ M, no more than 1×10⁻⁶ M, no more than 1×10⁻⁷ M, no more than 1×10⁻⁸ M, no more than 1×10⁻⁹ M, no more than 1×10⁻¹⁰ M, no more than 1×10⁻¹¹ M, or no more than 1×10⁻¹² M. Preferably the EC₅₀ is from about 5×10⁻⁷ M to 1×10⁻¹¹ M, such as from about 1×10⁻⁷ M to 5×10⁻¹⁰ M, from about 1×10⁻⁷ M to 1×10⁻⁹ M, 5×10⁻⁷ to 5×10⁻⁹ M, 5×10⁻⁷ to 5×10⁻¹⁰ M, from about 5×10⁻⁷ M to 1×10⁻¹⁰ M, or from about 5×10⁻⁷ M to 5×10⁻⁹ M.

In certain embodiments, the antibodies (or antigen-binding fragments) disclosed herein increases thrombin generation velocity index, with a half maximal effective concentration (EC₅₀) of no more than 1×10⁻⁴ M, no more than 1×10⁻⁵ M, no more than 1×10⁻⁶ M, no more than 1×10⁻⁷ M, no more than 1×10⁻⁸ M, no more than 1×10⁻⁹ M, no more than 1×10⁻¹⁰ M, no more than 1×10⁻¹¹ M, or no more than 1×10⁻¹² M. Preferably the EC₅₀ is from about 5×10⁻⁷ M to 1×10⁻¹¹ M, such as from about 1×10⁻⁷ M to 5×10⁻¹⁰ M, from about 1×10⁻⁷ M to 1×10⁻¹⁰ M, 1×10⁻⁷ M to 5×10⁻⁹ M, 5×10⁻⁷ M to 5×10⁻¹⁰ M, from about 5×10⁻⁷ M to 1×10⁻¹⁰ M, or from about 5×10⁻⁷ M to 5×10⁻⁹ M.

In certain embodiments, the antibody and antibody fragments disclosed herein may also be further assessed by other biological activity assays, e.g., in order to evaluate its potency, pharmacological activity, and potential efficacy as a therapeutic agent. Such assays are known in the art and depend on the target antigen and intended use for the antibody. Examples include e.g., tumor cell growth inhibition assays; antibody-dependent cellular cytotoxicity (ADCC) and complement-mediated cytotoxicity (CDC) assays; agonistic activity or antagonist activity assays.

C. Polynucleotides, Vectors, and Host Cells

The invention also provides polynucleotides encoding any of the TFPI binding antibodies of the disclosure, including antibody fragments and modified antibodies described herein, such as, e.g., antibodies having impaired Fc effector function. In another aspect, the invention provides a method of making any of the polynucleotides described herein. Polynucleotides can be made and expressed by procedures known in the art. Accordingly, the invention provides polynucleotides or compositions, including pharmaceutical compositions, comprising polynucleotides, encoding any of the TFPI antibodies and antigen-binding fragments thereof of the invention.

In one embodiment, the VH and VL domains, or antigen-binding fragment thereof, or full length HC or LC, are encoded by separate polynucleotides. Alternatively, both VH and VL, or antigen-binding fragment thereof, or HC and LC, are encoded by a single polynucleotide.

The invention provides polynucleotides, or compositions comprising the polynucleotides, encoding any of the TFPI antibodies and antigen-binding fragments thereof of the invention, including, but not limited to, TFPI-23, TFPI-24, TFPI-106, TFPI-107, and 4D8, wherein the sequence of the polynucleotide encompasses the sequence of SEQ ID NO:175 (encoding TFPI-106 VH region), SEQ ID NO:176 (encoding TFPI-106 VL region), SEQ ID NO:177 (encoding TFPI-106 Heavy Chain), and SEQ ID NO:178 (encoding TFPI-106 Light Chain).

In another aspect, the invention provides an isolated nucleic acid encoding the VH region of an antibody, or an antigen-binding portion thereof, that specifically binds TFPI, comprising the nucleic acid sequence of the insert present in the plasmid deposited as ATCC Accession No. PTA-122329.

In another aspect, the invention provides an isolated nucleic acid encoding the VL region of an antibody, or an antigen-binding portion thereof, that specifically binds TFPI, comprising the nucleic acid sequence of the insert present in the plasmid deposited as ATCC Accession No. PTA-122328.

In another aspect, the invention provides polynucleotides and variants thereof encoding a TFPI antibody, or portion thereof, wherein such variant polynucleotides comprise a nucleic acid sequence sharing at least 70%, at least 75%, at least 80%, at least 85%, at least 87%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99% sequence identity to any of the specific nucleic acid sequences disclosed herein. The degree of sequence identity over any length of nucleotide sequence can be calculated using methods familiar to those of ordinary skill in the art. In one non-limiting embodiment, percent sequence identity between two or more related nucleotide sequences can be determined using the nucleotide BLAST server available from the National Library of Medicine (http://blast.ncbi.nlm.nih.gov/). This software provides different settings that one of ordinary skill can use to optimize sequence comparisons depending on such factors as length, complexity, and other factors.

The invention provides a nucleic acid molecule comprising a nucleotide sequence encoding an amino acid sequence of any TFPI antibody, and antigen-biding fragment thereof, of the invention, including, but not limited to, an amino acid sequence of an antibody, or antigen-binding fragment thereof, provided in Table 33 (e.g., an amino acid sequence of SEQ ID NOs:21-174), and any antibody that binds the same epitope as and/or competes for binding of TFPI with an antibody of the invention.

In another aspect, the invention provides polynucleotides and variants thereof encoding a TFPI antibody, wherein such variant polynucleotides encode an amino acid sequence sharing at least 70%, at least 75%, at least 80%, at least 85%, at least 87%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99% sequence identity to any TFPI antibody amino acid sequence disclosed herein.

In other embodiments, the degree of relatedness between nucleic acids comprising a variant polynucleotide sequence encoding a TFPI antibody, or portion thereof, and any of the specific nucleotide sequences disclosed herein can be determined by testing if the variant sequence (or complement thereto) can hybridize with a specific nucleotide sequence (or complement thereto) under moderate or highly stringent conditions in a Northern blot or Southern blot assay format. Exemplary and non-limiting “moderately stringent conditions” include prewashing in a solution of 5×SSC, 0.5% SDS, 1.0 mM EDTA (pH 8.0); hybridizing at 50° C.-65° C., 5×SSC, overnight; followed by washing twice at 65° C. for 20 minutes with each of 2×, 0.5× and 0.2×SSC containing 0.1% SDS.

Exemplary and non-limiting, “highly stringent conditions” or “high stringency conditions” are those that: (1) employ low ionic strength and high temperature for washing, for example 0.015 M sodium chloride/0.0015 M sodium citrate/0.1% sodium dodecyl sulfate at 50° C.; (2) employ during hybridization a denaturing agent, such as formamide, for example, 50% (v/v) formamide with 0.1% bovine serum albumin/0.1% Ficoll/0.1% polyvinylpyrrolidone/50 mM sodium phosphate buffer at pH 6.5 with 750 mM sodium chloride, 75 mM sodium citrate at 42° C.; or (3) employ 50% formamide, 5×SSC (0.75 M NaCl, 0.075 M sodium citrate), 50 mM sodium phosphate (pH 6.8), 0.1% sodium pyrophosphate, 5×Denhardt's solution, sonicated salmon sperm DNA (50 μg/ml), 0.1% SDS, and 10% dextran sulfate at 42° C., with washes at 42° C. in 0.2×SSC (sodium chloride/sodium citrate) and 50% formamide at 55° C., followed by a high-stringency wash consisting of 0.1×SSC containing EDTA at 55° C. The skilled artisan will recognize how to adjust the temperature, ionic strength, etc. as necessary to accommodate factors such as probe length and the like. One of ordinary skill in the art will also be familiar with standard techniques for conducting a Northern blot or Southern blot assay to detect the degree of relatedness between variant a nucleotide sequence and a specific nucleotide sequence of the disclosure.

Polynucleotides complementary to any such sequences are also encompassed by the present invention. Polynucleotides may be single-stranded (coding or antisense) or double-stranded, and may be DNA (genomic, cDNA or synthetic) or RNA molecules. RNA molecules include hnRNA molecules, which contain introns and correspond to a DNA molecule in a one-to-one manner, and mRNA molecules, which do not contain introns. Additional coding or non-coding sequences may, but need not, be present within a polynucleotide of the present invention.

Variants may also, or alternatively, be substantially homologous to a native gene, or a portion or complement thereof. Such polynucleotide variants are capable of hybridizing under moderately stringent conditions to a naturally occurring DNA sequence encoding a native antibody (or a complementary sequence).

It will be appreciated by those of ordinary skill in the art that, as a result of the degeneracy of the genetic code, there are many nucleotide sequences capable of encoding any of the TFPI antibodies, or portions thereof, disclosed herein. Some of these polynucleotides may bear a relatively low degree of sequence identity to any of the specific nucleotide sequences for TFPI antibodies provided herein, while encoding the same amino acid sequence. Nonetheless, polynucleotides that vary due to differences in codon usage are specifically contemplated by the present invention.

The polynucleotides of this invention can be obtained using chemical synthesis, recombinant methods, or PCR. Methods of chemical polynucleotide synthesis are well known in the art and need not be described in detail herein. One of skill in the art can use the sequences provided herein and a commercial DNA synthesizer to produce a desired DNA sequence.

For preparing polynucleotides using recombinant methods, a polynucleotide comprising a desired sequence can be inserted into a suitable vector, and the vector in turn can be introduced into a suitable host cell for replication and amplification, as further discussed herein. Polynucleotides may be inserted into host cells by any means known in the art. Cells can be transformed by introducing an exogenous polynucleotide by direct uptake, endocytosis, transfection, F-mating or electroporation. Once introduced, the exogenous polynucleotide can be maintained within the cell as a non-integrated vector (such as a plasmid) or integrated into the host cell genome. The polynucleotide so amplified can be isolated from the host cell by methods well known within the art. See, e.g., Sambrook et al., 1989.

Alternatively, PCR allows reproduction of DNA sequences. PCR technology is well known in the art and is described in U.S. Pat. Nos. 4,683,195, 4,800,159, 4,754,065 and 4,683,202, as well as PCR: The Polymerase Chain Reaction, Mullis et al. eds., Birkauswer Press, Boston, 1994.

RNA can be obtained by using the isolated DNA in an appropriate vector and inserting it into a suitable host cell. When the cell replicates and the DNA is transcribed into RNA, the RNA can then be isolated using methods well known to those of skill in the art, as set forth in Sambrook et al., 1989, supra, for example.

Suitable cloning vectors may be constructed according to standard techniques, or may be selected from a large number of cloning vectors available in the art. While the cloning vector selected may vary according to the host cell intended to be used, useful cloning vectors will generally have the ability to self-replicate, may possess a single target for a particular restriction endonuclease, and/or may carry genes for a marker that can be used in selecting clones containing the vector. Suitable examples include plasmids and bacterial viruses, e.g., pUC18, pUC19, Bluescript (e.g., pBS SK+) and its derivatives, mp18, mp19, pBR322, pMB9, ColE1, pCR1, RP4, phage DNAs, and shuttle vectors such as pSA3 and pAT28. These and many other cloning vectors are available from commercial vendors such as BioRad, Stratagene, and Invitrogen.

Expression vectors are further provided. Expression vectors generally are replicable polynucleotide constructs that contain a polynucleotide according to the invention. It is implied that an expression vector must be replicable in the host cells either as episomes or as an integral part of the chromosomal DNA. Suitable expression vectors include but are not limited to plasmids, viral vectors, including adenoviruses, adeno-associated viruses, retroviruses, cosmids, and expression vector(s) disclosed in PCT Publication No. WO 87/04462. Vector components may generally include, but are not limited to, one or more of the following: a signal sequence; an origin of replication; one or more marker genes; suitable transcriptional controlling elements (such as promoters, enhancers and terminator). For expression (i.e., translation), one or more translational controlling elements are also usually required, such as ribosome binding sites, translation initiation sites, and stop codons.

The vectors containing the polynucleotides of interest and/or the polynucleotides themselves, can be introduced into the host cell by any of a number of appropriate means, including electroporation, transfection employing calcium chloride, rubidium chloride, calcium phosphate, DEAE-dextran, or other substances; microprojectile bombardment; lipofection; and infection (e.g., where the vector is an infectious agent such as vaccinia virus). The choice of introducing vectors or polynucleotides will often depend on features of the host cell.

The invention also provides host cells comprising any of the polynucleotides described herein. Any host cells capable of over-expressing heterologous DNAs can be used for the purpose of isolating the genes encoding the antibody, polypeptide or protein of interest. Non-limiting examples of mammalian host cells include but not limited to simian COS, human HeLa, human embryonic kidney (HEK) 293, Sp2.0 and Chinese hamster ovary (CHO) cells. See also PCT Publication No. WO 87/04462. Suitable non-mammalian host cells include prokaryotes (such as E. coli or B. subtillis) and yeast (such as S. cerevisae, S. pombe; or K. lactis). Screening for host cells expressing a TFPI antibody, or antigen binding portion thereof, can be detected using an immune-binding assay, such as ELISA, FACS, or other assay familiar to those of ordinary skill in the art.

Thus, the antibody (or antigen-binding fragment thereof) of the invention may be recombinantly produced using a suitable host cell. Nucleic acid encoding the antibody or antigen-binding fragment thereof can be cloned into an expression vector, which can then be introduced into a host cell, such as E. coli cell, a yeast cell, an insect cell, a COS cell, a CHO cell, or a myeloma cell that do not otherwise produce immunoglobulin protein, to obtain the synthesis of monoclonal antibodies in the recombinant host cells. Exemplary host cells include CHO cell, HEK 293, and Sp2.0 cells.

An expression vector can be used to direct expression of a TFPI antibody. One skilled in the art is familiar with administration of expression vectors to obtain expression of an exogenous protein in vivo. See, e.g., U.S. Pat. Nos. 6,436,908; 6,413,942; and 6,376,471. Administration of expression vectors includes local or systemic administration, including injection, oral administration, particle gun or catheterized administration, and topical administration. According to certain non-limiting embodiments, the expression vector is administered directly to the liver, skeletal muscles, bone marrow, or other tissues.

Targeted delivery of therapeutic compositions containing an expression vector, or subgenomic polynucleotides can also be used. Receptor-mediated DNA delivery techniques are described in, for example, Findeis et al., Trends Biotechnol., 1993, 11:202; Chiou et al., Gene Therapeutics: Methods And Applications Of Direct Gene Transfer, J. A. Wolff, ed., 1994; Wu et al., J. Biol. Chem., 1988, 263:621; Wu et al., J. Biol. Chem., 1994, 269:542; Zenke et al., Proc. Natl. Acad. Sci. USA, 1990, 87:3655; Wu et al., J. Biol. Chem., 1991, 266:338. Therapeutic compositions containing a polynucleotide are administered in a range of about 100 ng to about 200 mg of DNA for local administration in a gene therapy protocol. Concentration ranges of about 500 ng to about 50 mg, about 1 μg to about 2 mg, about 5 μg to about 500 μg, and about 20 μg to about 100 μg of DNA can also be used during a gene therapy protocol. The therapeutic polynucleotides and polypeptides can be delivered using gene delivery vehicles. The gene delivery vehicle can be of viral or non-viral origin (see generally, Jolly, Cancer Gene Therapy, 1994, 1:51; Kimura, Human Gene Therapy, 1994, 5:845; Connelly, Human Gene Therapy, 1995, 1:185; and Kaplitt, Nature Genetics, 1994, 6:148). Expression of such coding sequences can be induced using endogenous mammalian or heterologous promoters. Expression of the coding sequence can be either constitutive or regulated.

Viral-based vectors for delivery of a desired polynucleotide and expression in a desired cell are well known in the art. Exemplary viral-based vehicles include, but are not limited to, recombinant retroviruses (see, e.g., PCT Publication Nos. WO 90/07936; WO 94/03622; WO 93/25698; WO 93/25234; WO 93/11230; WO 93/10218; WO 91/02805; U.S. Pat. Nos. 5,219,740 and 4,777,127; GB Patent No. 2,200,651; and EP Patent No. 0 345 242), alphavirus-based vectors (e.g., Sindbis virus vectors, Semliki forest virus (ATCC VR-67; ATCC VR-1247), Ross River virus (ATCC VR-373; ATCC VR-1246) and Venezuelan equine encephalitis virus (ATCC VR-923; ATCC VR-1250; ATCC VR 1249; ATCC VR-532)), and adeno-associated virus (AAV) vectors (see, e.g., PCT Publication Nos. WO 94/12649, WO 93/03769; WO 93/19191; WO 94/28938; WO 95/11984 and WO 95/00655). Administration of DNA linked to killed adenovirus as described in Curiel, Hum. Gene Ther., 1992, 3:147 can also be employed.

Non-viral delivery vehicles and methods can also be employed, including, but not limited to, polycationic condensed DNA linked or unlinked to killed adenovirus alone (see, e.g., Curiel, Hum. Gene Ther., 1992, 3:147); ligand-linked DNA (see, e.g., Wu, J. Biol. Chem., 1989, 264:16985); eukaryotic cell delivery vehicles cells (see, e.g., U.S. Pat. No. 5,814,482; PCT Publication Nos. WO 95/07994; WO 96/17072; WO 95/30763; and WO 97/42338) and nucleic charge neutralization or fusion with cell membranes. Naked DNA can also be employed. Exemplary naked DNA introduction methods are described in PCT Publication No. WO 90/11092 and U.S. Pat. No. 5,580,859. Liposomes that can act as gene delivery vehicles are described in U.S. Pat. No. 5,422,120; PCT Publication Nos. WO 95/13796; WO 94/23697; WO 91/14445; and EP 0524968. Additional approaches are described in Philip, Mol. Cell Biol., 1994, 14:2411, and in Woffendin, Proc. Natl. Acad. Sci., 1994, 91:1581.

The sequence of a desired antibody (or antigen-binding fragment thereof), and nucleic acid encoding such antibody (or antigen-binding fragment thereof), can be determined using standard sequencing techniques. Nucleic acid sequence encoding a desired antibody (or fragments) may be inserted into other vectors (such as cloning and expression vectors) for recombinant production and characterization. Heavy chain (or a fragment of the heavy chain) and light chain (or a fragment of the light chain) can be cloned in the same vector, or different vectors.

Suitable cloning and expression vectors can include a variety of components, such as promoter, enhancer, and other transcriptional regulatory sequences. The vector may also be constructed to allow for movement of antibody variable domain between different vectors.

Antibody fragments can be produced by proteolytic or other degradation of the antibodies, by recombinant methods, or by chemical synthesis. Polypeptides of the antibodies, especially shorter polypeptides up to about 50 amino acids, are conveniently made by chemical synthesis. Methods of chemical synthesis are known in the art and are commercially available.

The antibody or antigen-binding fragment thereof disclosed herein may be affinity-matured. For example, affinity matured antibodies can be produced by procedures known in the art (Marks et al., 1992, Bio/Technology, 10:779-783; Barbas et al., 1994, Proc. Nat. Acad. Sci. USA 91:3809-3813; Schier et al., 1995, Gene, 169:147-155; Yelton et al., 1995, J. Immunol., 155:1994-2004; Jackson et al., 1995, J. Immunol., 154(7):3310-3319; Hawkins et al., 1992, J. Mol. Biol., 226:889-896; and WO2004/058184).

4. Formulations and Uses

Antibodies or antigen-binding fragments described herein can be formulated as pharmaceutical formulations. The pharmaceutical formulation may further comprise pharmaceutically acceptable carriers, excipients, or stabilizers (Remington: The Science and practice of Pharmacy 20th Ed., 2000, Lippincott Williams and Wilkins, Ed. K. E. Hoover), in the form of lyophilized formulations or aqueous solutions. Acceptable carriers, excipients, or stabilizers are nontoxic to recipients at the dosages and concentrations, and may comprise buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid and methionine; preservatives (such as octadecyldimethylbenzyl ammonium chloride; hexamethonium chloride; benzalkonium chloride, benzethonium chloride; phenol, butyl or benzyl alcohol; alkyl parabens such as methyl or propyl paraben; catechol; resorcinol; cyclohexanol; 3-pentanol; and m-cresol); low molecular weight (less than about 10 residues) polypeptides; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, histidine, arginine, or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrans; chelating agents such as EDTA; sugars such as sucrose, mannitol, trehalose or sorbitol; salt-forming counter-ions such as sodium; metal complexes (e.g. Zn-protein complexes); and/or non-ionic surfactants such as TWEEN™, PLURONICS™ or polyethylene glycol (PEG). Pharmaceutically acceptable excipients are further described herein.

The antibodies or antigen-binding fragments described herein can be used for various therapeutic or diagnostic purposes. For example, the antibody or antigen-binding fragment thereof may be used as an affinity purification agents (e.g., for in vitro purification of TFPI), as a diagnostic agent (e.g., for detecting expression of TFPI in specific cells, tissues, or serum).

Exemplary therapeutic uses of the antibody and antibody fragments of the invention include treating thrombocytopenia, platelet disorders (disorders of platelet function or number), and bleeding disorders (e.g., hemophilia A, hemophilia B and hemophilia C). The antibodies and antibody fragments may also be used for treating uncontrolled bleeding in indications such as trauma and hemorrhagic stroke. The antibodies and antibody fragments may also be used in prophylactic treatment (e.g., before surgeries).

In particular, antibodies or antigen-binding fragments described herein can be used to treat deficiencies or defects in coagulation. For example, the antibodies or antigen-binding fragments described herein may be used to reduce or inhibit the interaction of TFPI with FXa, or to reduce TFPI-dependent inhibition of the TF/FVIIa/FXa activity.

For therapeutic applications, antibodies or antigen-binding fragments described herein can be administered to a mammal, especially a human by conventional techniques, such as intravenously (as a bolus or by continuous infusion over a period of time), intramuscularly, intraperitoneally, intra-cerebrospinally, subcutaneously, intra-articularly, intrasynovially, intrathecally, orally, topically, or by inhalation. The antibodies or antigen-binding fragments also are suitably administered by intra-tumoral, peri-tumoral, intra-lesional, or peri-lesional routes.

Accordingly, in one aspect, the invention provides a method of reducing the activity of Tissue Factor Pathway Inhibitor (TFPI), comprising administering to a subject in need thereof a therapeutically effective amount of the antibodies or antigen-binding fragments described herein. In another aspect, the invention provides a method of shortening bleeding time, comprising administering to a subject in need thereof a therapeutically effective amount of the antibodies or antigen-binding fragments described herein.

In certain embodiments, the subject is a human.

In certain embodiments, the subject suffers from or is susceptible to a deficiency in blood coagulation. Deficiency in blood coagulation includes, e.g., von Willebrand disease (vWD), hemophilia A, B, or C, and other platelet disorders (such as congenital platelet defects, congenital and acquired storage pool deficiency, prolonged bleeding time).

In certain embodiments, the antibodies or antigen-binding fragments described herein is administered subcutaneously. In certain embodiments, the antibodies or antigen-binding fragments described herein is administered intravenously.

The pharmaceutical compositions may be administered to a subject in need thereof at a frequency that may vary with the severity of the bleeding episode or, in the case of prophylactic therapy, may vary with the severity of the patient's clotting deficiency.

The compositions may be administered to patients in need as a bolus or by continuous infusion. For example, a bolus administration of an antibody present as a Fab fragment may be in an amount of from 0.0025 to 100 mg/kg body weight, 0.025 to 0.25 mg/kg, 0.010 to 0.10 mg/kg or 0.10-0.50 mg/kg. For continuous infusion, an antibody present as an Fab fragment may be administered at 0.001 to 100 mg/kg body weight/minute, 0.0125 to 1.25 mg/kg/min, 0.010 to 0.75 mg/kg/min, 0.010 to 1.0 mg/kg/min. or 0.10-0.50 mg/kg/min for a period of 1-24 hours, 1-12 hours, 2-12 hours, 6-12 hours, 2-8 hours, or 1-2 hours.

For administration of an antibody present as a full-length antibody (with full constant regions), dosage amounts may be from about 1 mg/kg to about 10 mg/kg, from about 2 mg/kg to about 10 mg/kg, from about 3 mg/kg to about 10 mg/kg, from about 4 mg/kg to about 10 mg/kg, from about 5 mg/kg to about 10 mg/kg, from about 1 mg/kg to about 20 mg/kg, from about 2 mg/kg to about 20 mg/kg, from about 3 mg/kg to about 20 mg/kg, from about 4 mg/kg to about 20 mg/kg, from about 5 mg/kg to about 20 mg/kg, about 1 mg/kg or more, about 2 mg/kg or more, about 3 mg/kg or more, about 4 mg/kg or more, about 5 mg/kg or more, about 6 mg/kg or more, about 7 mg/kg or more, about 8 mg/kg or more, about 9 mg/kg or more, about 10 mg/kg or more, about 11 mg/kg or more, about 12 mg/kg or more, about 13 mg/kg or more, about 14 mg/kg or more, about 15 mg/kg or more, about 16 mg/kg or more, about 17 mg/kg or more, about 19 mg/kg or more, or about 20 mg/kg or more. The frequency of the administration would depend upon the severity of the condition. Frequency could range from three times per week to once every two or three weeks.

Additionally, the compositions may be administered to patients via subcutaneous injection. For example, a dose of 1 to 100 mg anti-TFPI antibody can be administered to patients via subcutaneous injection once every day, once every 2 days, once every 3 days, once every 4 days, once every 5 days, once every 6 days, twice a week, weekly, biweekly, or monthly.

In certain embodiments, the pharmaceutical composition is administered subcutaneous by a weekly schedule, with a dose from about 0.1 mg/kg to about 10 mg/kg, from about 0.5 mg/kg to about 10 mg/kg, from about 1 mg/kg to about 10 mg/kg, from about 1.5 mg/kg to about 10 mg/kg, from about 2 mg/kg to about 10 mg/kg, from about 0.1 mg/kg to about 8 mg/kg, from about 0.5 mg/kg to about 8 mg/kg, from about 1 mg/kg to about 8 mg/kg, from about 1.5 mg/kg to about 8 mg/kg, from about 2 mg/kg to about 8 mg/kg, from about 0.1 mg/kg to about 5 mg/kg, from about 0.5 mg/kg to about 5 mg/kg, from about 1 mg/kg to about 5 mg/kg, from about 1.5 mg/kg to about 5 mg/kg, from about 2 mg/kg to about 5 mg/kg, about 0.5 mg/kg, about 1.0 mg/kg, about 1.5 mg/kg, about 2.0 mg/kg, about 2.5 mg/kg, about 3.0 mg/kg, about 3.5 mg/kg, about 4.0 mg/kg, about 4.5 mg/kg, about 5.0 mg/kg, about 5.5 mg/kg, about 6.0 mg/kg, about 6.5 mg/kg, about 7.0 mg/kg, about 7.5 mg/kg, about 8.0 mg/kg, about 8.5 mg/kg, about 9.0 mg/kg, about 9.5 mg/kg, or about 10.0 mg/kg.

In certain embodiments, the pharmaceutical composition is administered subcutaneous by a weekly schedule, with a dose of about 2.0 mg/kg. In certain embodiments, the pharmaceutical composition is administered subcutaneous by a weekly schedule, with a dose of about 3.0 mg/kg.

The antibodies and antibody fragments described herein can be used as monotherapy or in combination with other therapies to address a hemostatic disorder. For example, co-administration of one or more antibodies (or antibody fragments) of the invention with a clotting agent such as factor VIIa, factor VIII, factor IX or tranexamic acid may be useful for treating hemophilia.

In one embodiment, provided is a method for treating a deficiency in coagulation or shortening bleeding time, comprising administering (a) a first amount of the antibody or antigen-binding fragment of the invention, and (b) a second amount of factor VIII or factor IX. Optionally, factor VII is not co-administered. In another embodiment, provided is a method for treating a deficiency in coagulation or shortening bleed time, comprising administering (a) a first amount of the antibody or antigen-binding fragment of the invention and (b) a second amount of factor VIII or factor IX. Optionally, factor VII is not co-administered. One skilled in the art would appreciate that in treating a deficiency in coagulation, a shortening in bleeding time can also be referred to as a shortening in clotting time.

The invention also includes a pharmaceutical composition comprising a therapeutically effective amount of the combination of an antibody (or antibody fragment) of the invention and factor VIII or factor IX, wherein the composition does not comprise factor VII. “Factor VII” includes factor VII and factor VIIa.

Biological Deposit

Representative materials of the present invention were deposited in the American Type Culture Collection, 10801 University Boulevard, Manassas, Va. 20110-2209, USA, on Jul. 22, 2015. Plasmid vector mAb-TFPI-106 VH having ATCC Accession No. PTA-122329 comprises a DNA insert encoding the heavy chain variable region of antibody TFPI-106, and plasmid vector mAb-TFPI-106 VL having ATCC Accession No. PTA-122328 comprises a DNA insert encoding the light chain variable region of antibody TFPI-106. The deposits were made under the provisions of the Budapest Treaty on the International Recognition of the Deposit of Microorganisms for the Purpose of Patent Procedure and Regulations thereunder (Budapest Treaty). This assures maintenance of a viable culture of the deposit for 30 years from the date of deposit. The deposit will be made available by ATCC under the terms of the Budapest Treaty, and subject to an agreement between Pfizer Inc. and ATCC, which assures permanent and unrestricted availability of the progeny of the culture of the deposit to the public upon issuance of the pertinent U.S. patent or upon laying open to the public of any U.S. or foreign patent application, whichever comes first, and assures availability of the progeny to one determined by the U.S. Commissioner of Patents and Trademarks to be entitled thereto according to 35 U.S.C. Section 122 and the Commissioner's rules pursuant thereto (including 37 C.F.R. Section 1.14 with particular reference to 886 OG 638).

The assignee of the present application has agreed that if a culture of the materials on deposit should die or be lost or destroyed when cultivated under suitable conditions, the materials will be promptly replaced on notification with another of the same. Availability of the deposited material is not to be construed as a license to practice the invention in contravention of the rights granted under the authority of any government in accordance with its patent laws.

Examples

The invention is further described in detail by reference to the following experimental examples. These examples are provided for purposes of illustration only, and are not intended to be limiting unless otherwise specified. Thus, the invention should in no way be construed as being limited to the following examples, but rather, should be construed to encompass any and all variations which become evident as a result of the teaching provided herein.

Example 1 Experimental Materials and Methods

1. TFPI Protein Reagents

Protein reagents used for immunization, phage display selection and characterization of anti-TFPI antibodies are listed in Table 1, and their sequence IDs are listed in Table 2.

The TFPI constructs (pSMED2 vector) were expressed transiently in HEK293F cells and conditioned media was harvested 120 hours post transfection. The protein of interest was captured from conditioned media using Nickel Sepharose HP and further purified by size exclusion chromatography. Factor Xa and Factor X were obtained from Haematologic Technologies, Inc. The chromogenic substrate for the for the amidolytic assay of Factor Xa, Spectrozyme®FXa was obtained from Sekisui Diagnostics.

TABLE 1 Protein reagents used for immunization, phage display selection and identification of anti-TFPI antibodies SeqID (see table 2) Secretory Protein Reagent Species Leader TFPI C-terminal tag humTFPI K1K2 human 9 1 8 humTFPI K1K2K3 human 9 2 8 humTFPI2 K1K2K3 human 9 3 8 murTFPI K1K2 mouse 9 4 8 cynTFPI K1K2 cynomolgus 9 5 8 monkey rabTFPI K1K2 rabbit 9 6 8 ratTFPI K1K2 rat 9 7 8

TABLE 2 TFPI reagent sequence identification numbers, descriptions and sequences Seq ID Description Sequence 1 Human TFPIα K1K2 DSEEDEEHTI ITDTELPPLK LMHSFCAFKA DDGPCKAIMK (Accession #P10646, RFFFNIFTRQ CEEFIYGGCE GNQNRFESLE ECKKMCTRDN residues 29-177) ANRIIKTTLQ QEKPDFCFLE EDPGICRGYI TRYFYNNQTK QCERFKYGGC LGNMNNFETL EECKNICED 2 Human TFPIα DSEEDEEHTI ITDTELPPLK LMHSFCAFKA DDGPCKAIMK K1K2K3 (Accession RFFFNIFTRQ CEEFIYGGCE GNQNRFESLE ECKKMCTRDN #P10646, residues 29- ANRIIKTTLQ QEKPDFCFLE EDPGICRGYI TRYFYNNQTK 282) QCERFKYGGC LGNMNNFETL EECKNICEDG PNGFQVDNYG TQLNAVNNSL TPQSTKVPSL FEFHGPSWCL TPADRGLCRA NENRFYYNSV IGKCRPFKYS GCGGNENNFT SKQECLRACK KGFIQRISKG GLIK 3 Human TFPI2 DAAQEPTGNN AEICLLPLDY GPCRALLLRY YYDRYTQSCR K1K2K3 (Accession QFLYGGCEGN ANNFYTWEAC DDACWRIEKV PKVCRLQVSV #P10646, residues 23- DDQCEGSTEK YFFNLSSMTC EKFFSGGCHR NRIENRFPDE 211) ATCMGFCAPK KIPSFCYSPK DEGLCSANVT RYYFNPRYRT CDAFTYTGCG GNDNNFVSRE DCKRACAKA 4 Mouse TFPI K1K2 LSEEADDTDS ELGSMKPLHT FCAMKADDGP CKAMIRSYFF (Accession #O54819, NMYTHQCEEF IYGGCEGNEN RFDTLEECKK TCIPGYEKTA residues 29-174) VKAASGAERP DFCFLEEDPG LCRGYMKRYL YNNQTKQCER FVYGGCLGNR NNFETLDECK KICENP 5 Cynomolgus Monkey DSEEDEEYTI ITDTELPPLK LMHSFCAFKP DDGPCKAIMK TFPI K1K2 (Accession RFFFNIFTRQ CEEFIYGGCG GNQNRFESME ECKKVCTRDN #Q2PFV4, VNRIIQTALQ KEKPDFCFLE EDPGICRGYI TRYFYNNQSK residues 29-177) QCERFKYGGC LGNMNNFETL EECKNTCED 6 Rabbit TFPI K1K2 AAEEDEEFTN ITDIKPPLQK PTHSFCAMKV DDGPCRAYIK (Accession #P19761, RFFFNILTHQ CEEFIYGGCE GNENRFESLE ECKEKCARDY residues 29-177) PKMTTKLTFQ KGKPDFCFLE EDPGICRGYI TRYFYNNQSK QCERFKYGGC LGNLNNFESL EECKNTCEN 7 Rat TFPI K1K2 LPEEDDDTIN TDSELRPMKP LHTFCAMKAE DGPCKAMIRS (Accession #Q02445, YYFNMNSHQC EEFIYGGCRG NKNRFDTLEE CRKTCIPGYK residues 29-176) KTTIKTTSGA EKPDFCFLEE DPGICRGFMT RYFYNNQSKQ CEQFKYGGCL GNSNNFETLE ECRNTCED 8 Spacer residues in GGGSGG GLND IFEAQKIEWH E GGPP HHHHH HHHHH italics, AviTag ™ is underlined, His-8 tag in bold 9 Mouse Ig kappa METDTLLLWV LLLWVPGSTG secretory leader (Accession #P01661, residues 1-20)

2. Antibody Reagents

The monoclonal antibodies used for comparative purposes (reference antibodies 2A8, 2A8-200, 3F18, hz4F36) are listed in Table 3. The antibody descriptions, sources and sequences are listed in Table 4 (FIG. 5). The light chain and heavy chain sequences were cloned into the appropriate vectors and were expressed transiently in Human Embryonic Kidney-293 (HEK-293) cells, and purified by Protein A Sepharose and size exclusion chromatography. Mab 2974 was obtained from R&D Systems (catalog # MAB2974).

TABLE 3 Antibody sequence identification numbers (SeqID) for light chain (LC) CDR1,2,3, variable light (VL), constant light (CL), light chain (LC), heavy chain (HC) CDR1,2,3, variable heavy (VH), constant heavy (CH) and heavy chain (HC) regions. Sequence compositions for SeqID numbers are in Table 4. Light Chain SeqID (See Table 4) Heavy Chain SeqID (See Table 4) LC LC LC HC HC HC Antibody CDR 1 CDR 2 CDR 3 VL CL LC CDR 1 CDR 2 CDR 3 VH CH HC TFPI-3 10 11 12 13 14 15 16 17 18 19 20 21 TFPI-21 22 23 24 25 26 27 28 29 30 31 20 32 TFPI-23 33 34 35 36 26 37 38 39 40 41 20 42 TFPI-24 43 44 45 46 26 47 48 49 50 51 20 52 TFPI-26 53 54 55 56 26 57 58 59 60 61 20 62 TFPI-106 33 34 35 36 26 37 38 39 40 63 20 64 TFPI-107 33 34 35 36 26 37 38 39 40 65 20 66 TFPI-108 43 44 45 46 26 47 48 49 50 67 20 68 TFPI-109 43 44 45 46 26 47 48 49 50 69 20 70 TFPI-110 43 44 45 71 26 72 48 49 50 51 20 52 TFPI-111 43 44 45 73 26 74 48 49 50 51 20 52 TFPI-112 43 44 45 75 26 76 48 49 50 51 20 52 TFPI-113 43 44 45 77 26 78 48 49 50 51 20 52 TFPI-114 43 44 45 46 26 47 48 49 50 79 20 80 TFPI-115 43 44 45 71 26 72 48 49 50 67 20 68 TFPI-118 43 44 45 77 26 78 48 49 50 67 20 68 TFPI-119 43 44 45 71 26 72 48 49 50 69 20 70 TFPI-122 43 44 45 77 26 78 48 49 50 69 20 70 TFPI-123 43 44 45 71 26 72 48 49 50 51 20 52 TFPI-126 43 44 45 77 26 78 48 49 50 51 20 52 4D8.b1 81 82 83 84 85 86 87 88 89 90 91 92 mu-hu 4D8 chimera 81 82 83 84 14 93 87 88 89 90 20 94 4D8-V_(k)1.0 × V_(H)1.0 81 82 83 109 14 110 87 88 89 95 20 96 4D8-V_(k)1.0 × V_(H)1.1 81 82 83 109 14 110 87 88 89 97 20 98 4D8-V_(k)1.0 × V_(H)1.2 81 82 83 109 14 110 87 88 89 99 20 100 4D8-V_(k)1.0 × V_(H)1.3 81 82 83 109 14 110 87 88 89 101 20 102 4D8-V_(k)1.0 × V_(H)1.4 81 82 83 109 14 110 87 88 89 103 20 104 4D8-V_(k)1.0 × V_(H)1.5 81 82 83 109 14 110 87 88 89 105 20 106 4D8-V_(k)1.0 × V_(H)1.6 81 82 83 109 14 110 87 88 89 107 20 108 4D8-V_(k)1.1 × V_(H)1.0 81 82 83 111 14 112 87 88 89 95 20 96 4D8-V_(k)1.1 × V_(H)1.1 81 82 83 111 14 112 87 88 89 97 20 98 4D8-V_(k)1.1 × V_(H)1.2 81 82 83 111 14 112 87 88 89 99 20 100 4D8-V_(k)1.1 × V_(H)1.3 81 82 83 111 14 112 87 88 89 101 20 102 4D8-V_(k)1.1 × V_(H)1.4 81 82 83 111 14 112 87 88 89 103 20 104 4D8-V_(k)1.1 × V_(H)1.5 81 82 83 111 14 112 87 88 89 105 20 106 4D8-V_(k)1.1 × V_(H)1.6 81 82 83 111 14 112 87 88 89 107 20 108 hz4D8 81 82 83 111 14 112 87 88 89 103 20 104 6B7.c5 113 114 115 116 85 117 118 119 120 121 91 122 7A4.D9 123 124 125 126 85 127 128 129 130 131 91 132 2A8 133 134 135 136 26 137 138 139 140 141 20 142 2A8-200 143 144 145 146 26 147 148 149 150 151 20 152 3F18 153 154 155 156 157 158 159 160 161 162 81 163 hz4F36 164 165 166 167 14 168 169 170 171 172 173 174

3. TFPI Binding ELISA

Recombinant humTFPI K1K2, murTFPI K1K2, cynTFPI K1K2, ratTFPI K1K2, rabTFPI K1K2 or TFPI2 was biotinylated using the AviTag™ system and captured onto Greiner streptavidin-coated 96 well plates at a concentration of 1×10⁻⁸ M in ELISA assay buffer. Purified anti-TFPI antibodies were diluted to 1 ug/ml in ELISA assay buffer, then serially diluted three-fold to generate an eight-point dilution series. The diluted antibodies were added at a volume of 100 uL per well. The plates were incubated at room temperature for 2 hours. After washing the plates with PBS/0.05% Tween 20, the plates were incubated with a goat anti-mouse IgG-Fc polyclonal antibody conjugated with horseradish peroxidase (Pierce) at 1:10,000 dilution. After 1 hour of incubation, bound antibody was detected with the addition of a TMB substrate solution. Absorbances were read a 450 nm, and the data were analyzed by GraphPad Prism software.

4. Surface Plasmon Resonance (SPR)

An anti-human Fc sensor chip was prepared by amine coupling anti-human IgG antibody (catalogue number BR-1008-39, GE Healthcare) to all four flow cells of a carboxymethylated dextran coated sensor chip (CM5) (catalogue number BR100530, GE Healthcare). The flow cells were activated by injecting a 1:1 mixture of 400 mM 1-Ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) for 7 minutes at a flow rate of 10 μl/minute. Anti-human IgG antibody was diluted to 25 μg/ml in 10 mM Sodium Acetate pH 5.0 and injected over all flow cells for 7 minutes at 10 ul/minute. All flow cells were blocked with 1M Ethanolamine-HCL (ETH) for 7 minutes at 10 μl/minute. Final immobilization level of the capture antibody was approximately 10,000 resonance units (RU). The running buffer for immobilization and kinetics was 10 mM HEPES pH 7.4, 150 mM NaCl, 3 mM EDTA, 0.05% (v/v) Tween-20 (HBS-EP+). To characterize the binding of anti-TFPI antibodies to human TFPI, the antibodies were diluted to 0.5 μg/mL in HBS-EP+ and captured by the anti-human IgG immobilized on flow cells 2, 3 and 4 for 30 seconds to 1 minute at a flow rate of 5 μL/minute to achieve a capture level of 70 to 300 RU. Flow cell 1 was used as a reference surface. After antibody capture, the flow rate was increased to 50 μL/minute and buffer or human TFPI ranging in concentration from 0.2 nM to 200 nM in HBS-EP+ was injected over all flow cells for a 1.0 minute association and allowed to dissociate for 10 to 15 minutes. Buffer cycles collected for each captured antibody were used for double-referencing (Myszka, D. G. J. Mol. Recognit. 12, 279-284 (1999)). At the end of each cycle, the entire anti-IgG surface was regenerated by a 60 second pulse of 3M MgCl2. Kinetic assays were conducted at 25° C. at a collection rate of 10 Hz on a BIAcore T200 instrument (GE Healthcare). Rate constants and affinities were determined by fitting the data to a 1:1 model in BIAcore T200 Evaluation software version 1.0 (GE).

5. Factor Xa TFPI Inhibition Reversal Assay

The ability of purified anti-TFPI antibodies to restore Factor Xa activity in the presence of inhibitory concentrations of TFPI was assessed in vitro. Anti-TFPI antibodies diluted in PBS at concentrations ranging from 1 nM-500 nM were pre-incubated with 10 nM recombinant human TFPI K1K2 or 10 nM rabbit TFPI K1K2 proteins in activity buffer (20 mM HEPES, pH 8.0, 150 mM NaCl, 5 mM CaCl₂, 0.5 mg/mL BSA) for 30 minutes at 37° C. 2 nM human plasma-derived Factor Xa was added and the reactions were incubated at 37° C. for 30 minutes. The chromogenic substrate Spectrozyme Xa was added to a final concentration of 500 uM for a final reaction volume of 100 uL. Control reactions included reactions without Factor Xa to control for assay background, without TFPI, allowing for maximal generation of FXa (100% activity) or without anti-TFPI antibody (PBS alone). Absorbances of the reactions were immediately read on a SpectraMax M5e multi-mode plate reader at a wavelength of 405 nm at 2 minute intervals over a period of 60 minutes. EC₅₀s were calculated with Prism Graph Pad software.

6. Two-Stage TF-FVIIa-FX Inhibition Reversal Assay

The ability of purified anti-TFPI antibodies to restore Factor VIIa-Tissue Factor activity in the presence of inhibitory concentrations of TFPI was assessed in vitro. Anti-TFPI antibodies at concentrations ranging from 1 nm-500 nM were pre-incubated with 10 nM recombinant TFPI proteins in activity buffer for 30 minutes at 37° C. Approximately 1 pM lipidated tissue factor and 1 nM recombinant Factor VIIa (NovoSeven) were added to the reactions and incubated at 37° C. for 5 minutes. 150 nM Human Factor X was introduced into the reactions. The chromogenic substrate Spectrozyme Xa was added to a final concentration of 500 uM to each well for a final reaction volume of 100 uL. Control reactions included reactions without Factor VIIa, without Tissue Factor, without Factor X, without TFPI or without anti-TFPI antibody (PBS alone). Absorbances of the reactions were immediately read on a SpectraMax M5e multi-mode plate reader at a wavelength of 405 nm at a 2 minute intervals over a period of 60 minutes. EC₅₀s were calculated with Prism Graph Pad software.

7. Thrombin Generation Assay (TGA)

The ability of purified anti-TFPI antibodies to restore thrombin generation in plasma with attenuated Factor VIII activity was assessed in thrombin generation assays using the Calibrated Automated Thrombogram (CAT) system. Anti-TFPI antibodies at concentrations of 1 nm-500 nm diluted in PBS were introduced into reactions containing human Factor VIII deficient plasma and PPP-Low reagent, containing 4 uM phospholipid and 1 pM Tissue Factor. Control reactions used PBS without antibody. Reactions were triggered with addition of Fluca buffer containing a fluorogenic thrombin substrate and CaCl₂. Fluorescence of each reaction was immediately read using a Fluoroskan Ascent plate reader using Thrombinoscope software at a 20 second interval for 60 minutes. Each reaction was compared to a calibrator control well containing PBS, thrombin calibrator, FVIII deficient plasma and FLUCA buffer. Thrombinoscope Thrombin generation curves (nM thrombin versus time) were analyzed to extract lag time, peak height, time to peak and the area under the curve or endogenous thrombin potential (ETP) using the Thrombinoscope software (Thrombinoscope BV version). The data were used to calculate velocity index (Peak thrombin concentration/Time to Peak−Lag Time).

The ability of purified anti-TFPI antibodies to restore thrombin generation in rabbit plasma with attenuated FVIIIa activity was also assessed. Normal New Zealand white rabbit plasma were treated with anti-FVIII antibody (GM-8015) at a final concentration of 100 ug/ml or control mouse anti-human IgG2a at 100 ug/mL for 60 minutes at 37° C. Immediately prior to addition into reaction wells, rabbit plasma was diluted 1:3 into buffer (20 mM HEPES, 140 mM NaCl). Thrombin generation assays with the FVIII neutralized rabbit plasma were performed as described above.

8. Generation of Cynomolgus TFPI K2 Domain for Structural Studies

Cynomolgus (cyno) TFPI K1K2 (Table 1) was expressed in HEK293 cells and conditioned media was harvested 120 hours post transfection. Purified Cyno TFPI K1K2 was incubated with human neutrophil elastase (HNE) at 1:70 (molar ratio HNE:TFPI) for 120 min at RT for cleavage to occur. Separation of cyno K1 from cyno K2 was performed using anion exchange chromatography on HQ50 (Poros). Size exclusion chromatography using Superdex 75 was performed as the final purification step. Endoproteinase AspN was used to trim the residual AviTag from the C-terminus of the cyno K2 domain.

9. Generation of Antibody Fab/Cyno TFPI K2 Complexes for Structural Studies

Anti-TFPI antibodies 4D8.b1, TFPI-23, TFPI-24, 2A8-200 (Table 3) and Mab 2974 (R&D systems) were digested with immobilized Papain per manufacturer's protocol (Thermo/Pierce). MabSelect SuRe was used to purify the Fabs from the digest, which were then used for complex formation with cyno TFPI K2. The Fab/cyno TFPI K2 complexes were then concentrated to approximately 16 mg/ml. The concentrated complexes were then used to screen for protein crystallization conditions.

Example 2 Generation of Mouse Anti-TFPI Antibodies

1. Mouse Immunization and Hybridoma Generation

A cohort of five BALB/c mice were each immunized subcutaneously with a mixture of 5 ug humTFPI K1K2 and 5 ug murTFPI K1K2 protein emulsified in Complete Freund's Adjuvant. The mice were subsequently immunized twice per week with the protein mixture alternately emulsified in Incomplete Freund's Adjuvant or diluted in PBS. Blood samples were taken on day 17 and day 27 (after the fifth and seventh immunizations, respectively), and sera were tested for the presence of circulating anti-TFPI antibodies by ELISA. By day 27, each mouse received a final boost of protein mixture (10 ug) intraperitoneally. Four days later, draining lymph nodes (axillary, inguinal and popliteal) were harvested, and pooled lymph node cells were mixed at a 1:1 ratio with the P3X63.Ag8.653 cells and subjected to electro-cell fusion. Fused cells were plated in RPMI1640 media supplemented with FBS (25%), NCTC-109 (12.5%), Glutamax (1%), Penicillin-Streptomycin (1%), Hybridoma Cloning Supplement (5%) and HAT (1×10⁻⁴M hypoxanthine, 4×10⁻⁷M aminopterin, and 1.6×10⁻⁵M thymidine). Fourteen days after the fusion hybridoma culture supernatants were tested for binding to humTFPI K1K2 by ELISA. Based upon their binding activity and their efficacy in functional assays, antibodies from three hybridomas, 4D8, 6B7 and 7A4, were selected for further characterization.

2. Cloning and Sequencing of Hybridoma-Derived Anti-TFPI Antibodies

RNA from hybridomas 4D8, 6B7 and 7A4 was prepared and the variable region DNA sequences from the expressed antibodies were obtained by RT-PCR cloning. The PCR products were cloned into the TOPO-TA cloning vector, then sequenced by conventional methods. One heavy chain and light chain cDNA pair was detected from hybridomas 6B7 and 7A4. Two heavy chain and light chain cDNAs were detected from 4D8.

Example 3 Characterization of Mouse Hybridoma Anti-TFPI Antibodies

Parental hybridomas 4D8, 6B7 and 7A4 were subcloned by limiting dilution to obtain monoclonal hybridoma cell lines. Positive subclones were identified by ELISA screening for reactivity with humTFPI K1K2 and expanded. Purified antibodies from one subclone of each hybridoma were characterized further.

1. TFPI Binding

Purified anti-TFPI antibodies 4D8.B1, 6B7.C5 and 7A4.D9 were tested for binding to recombinant human and rabbit TFPI proteins by protein-binding ELISA. The EC50 values of each antibody for both humTFPI K1K2-aviHis10 and rabTFPI K1K2 are shown in Table 5.

TABLE 5 EC50 (nM) values of mouse anti-TFPI MAbs for human and rabbit TFPI EC50 (nM) EC50 (nM) Antibody humTFPI K1K2 rabTFPI K1K2 4D8.B1 0.0959 0.0976 6B7.C5 0.1209 0.1289 7A4.D9 0.0887 0.0887

Surface plasmon resonance experiments were carried out to assess the affinity of the purified mouse anti-TFPI antibodies for human and rabbit TFPI K1K2 proteins. The k_(a), k_(d) and K_(D) values for each antibody binding to human and rabbit TFPI K1K2 are shown in Table 6.

TABLE 6 Kinetic measurements for anti-TFPI mouse hybridoma clones binding to human and rabbit TFPI Analyte Ligand k_(a) (1/Ms) k_(d)(1/s) K_(D) (nM) humTFPI K1K2 4D8.B1 9.58 × 10⁵ 1.14 × 10⁻³ 1.19 humTFPI K1K2 6B7.C5 5.52 × 10⁵ 3.63 × 10⁻³ 6.58 humTFPI K1K2 7A4.D9 1.48 × 10⁶ 9.21 × 10⁻³ 6.22 rabTFPI K1K2 4D8.B1 2.01 × 10⁶ 1.26 × 10⁻³ 0.63 rabTFPI K1K2 6B7.C5 1.14 × 10⁶ 5.64 × 10⁻³ 4.95 rabTFPI K1K2 7A4.D9 5.30 × 10⁶ 1.88 × 10⁻² 3.55

2. In Vitro Activity Assays

The anti-TFPI murine monoclonal antibodies were tested for activity in the FXa and TF-FXa-FVIIa inhibition reversal assays and the thrombin generation assay (TGA). The most potent antibody, 4D8.B1, was chosen to move forward for further studies.

TABLE 7 Activity of anti-TFPI murine monoclonal antibodies in the FXa and TF-FXa-FVIIa inhibition reversal assays and the thrombin generation assay (TGA) FXa FXa-FVIIa TGA Velocity Antibody EC50 (nM) EC50 (nM) Index at 20 nM 4D8.B1 5.9 6.67 26.3 6B7.C5 13.9 12.13 23.5 7A4.D9 22.3 9.35 23.3

Example 4 Generation of Chimeric and Humanized Antibodies from Clone 4D8

1. Generation of Mouse Human Chimeric Antibody 4D8

Variable region cDNAs derived from hybridoma 4D8 were subcloned into mammalian expression vectors to generate chimeric antibodies in which the mouse heavy chain variable region was fused in frame to human IgG1 3M (SEQ 20, Table 4), and the mouse light chain variable region was fused in frame to the human Ig kappa constant region (SEQ 62, Table 4). The chimeric constructs were transiently transfected into HEK293 cells. To identify the correct heavy and light chain pair from hybridoma 4D8 a total of four transient transfections were carried out with all possible heavy and light chain combinations. Antibody generated from one of the transfections was termed hu-mu 4D8 chimera (Tables 3 and 4).

2. Characterization of Mouse-Human Chimeric Antibody 4D8 (Mu-Hu 4D8)

Mu-hu 4D8 chimera was tested for its ability to bind both human and rabbit TFPI K1K2 proteins by protein binding ELISA (Table 8) and SPR (Table 9). The KD and EC50 values were closely comparable to those measured with purified mouse MAb 4D8.B1, demonstrating that grafting of the mouse variable regions grafted onto the human IgG1 background retained binding activity.

TABLE 8 EC50 (nM) values of mu-hu 4D8 chimera for human and rabbit TFPI EC50 (nM) EC50 (nM) Antibody humTFPI K1K2 rabTFPI K1K2 mu-hu 4D8 chimera 0.0577 0.0680

TABLE 9 Kinetic measurements for mu-hu 4D8 chimera binding to human and rabbit TFPI Analyte Ligand k_(a) (1/Ms) k_(d)(1/s) K_(D) (nM) humTFPI mu-hu 4D8 9.58 × 10⁵ 1.14 × 10⁻³ 1.19 K1K2 chimera rabTFPI mu-hu 4D8 2.01 × 10⁶ 1.26 × 10⁻³ 0.63 K1K2 chimera

3. Humanization of Hu-Mu 4D8 Chimera

The hu-mu 4D8 chimera sequence was humanized by CDR grafting onto human acceptor framework sequences. DP54 framework and DPK9 framework were chosen. Combinations of the heavy and light chain constructs (see Table 3) were then expressed. The antibodies were tested for human and rabbit TFPI binding in an ELISA binding assay (Table 10) and human TFPI binding in an SPR binding assay (Table 11).

TABLE 10 EC50 (nM) values of humanized 4D8 antibodies binding to human and rabbit TFPI K1K2 proteins EC50 (nM) EC50 (nM) Antibody hum TFPI K1K2 rabTFPI K1K2 4D8 V_(k) 1.0 × V_(H) 1.0 0.0772 0.0785 4D8 V_(k) 1.0 × V_(H) 1.1 0.0884 0.0705 4D8 V_(k) 1.0 × V_(H) 1.2 0.0758 0.0422 4D8 V_(k) 1.0 × V_(H) 1.3 0.0822 0.0556 4D8 V_(k) 1.0 × V_(H) 1.4 0.0560 0.0426 4D8 V_(k) 1.1 × V_(H) 1.0 0.0429 0.0451 4D8 V_(k) 1.1 × V_(H) 1.1 0.0818 0.0788 4D8 V_(k) 1.1 × V_(H) 1.2 0.0590 0.0783 4D8 V_(k) 1.1 × V_(H) 1.3 0.0651 0.0511 4D8 V_(k) 1.1 × V_(H) 1.4 0.0493 0.0716

TABLE 11 SPR analysis of humanized 4D8 antibodies binding to humTFPI K1K2 protein Antibody k_(a) (1/Ms) K_(d) (1/s) K_(D), nM 4D8 V_(k) 1.0 × V_(H) 1.0 6.77 × 10⁴ 4.70 × 10⁻⁴ 6.94 × 10⁻⁹  4D8 V_(k) 1.0 × V_(H) 1.1 6.06 × 10⁴ 1.54 × 10⁻³ 2.54 × 10⁻⁸  4D8 V_(k) 1.0 × V_(H) 1.2 2.38 × 10⁵ 1.65 × 10⁻⁴ 6.95 × 10⁻¹⁰ 4D8 V_(k) 1.0 × V_(H) 1.3 7.95 × 10⁴ 5.71 × 10⁻⁴ 7.19 × 10⁻⁹  4D8 V_(k) 1.0 × V_(H) 1.4 7.55 × 10⁴ 8.35 × 10⁻⁴ 1.11 × 10⁻⁸  4D8 V_(k) 1.1 × V_(H) 1.0 1.25 × 10⁵ 8.35 × 10⁻⁴ 5.50 × 10⁻¹⁰ 4D8 V_(k) 1.1 × V_(H) 1.1 1.93 × 10⁵ 1.61 × 10⁻⁴ 8.32 × 10⁻¹⁰ 4D8 V_(k) 1.1 × V_(H) 1.2 1.51 × 10⁵ 9.49 × 10⁻⁵ 6.27 × 10⁻¹⁰ 4D8 V_(k) 1.1 × V_(H) 1.3 1.59 × 10⁵ 1.31 × 10⁻⁴ 8.23 × 10⁻¹⁰ 4D8 V_(k) 1.1 × V_(H) 1.4 2.21 × 10⁵ 5.28 × 10⁻⁵ 2.93 × 10⁻¹⁰

Based upon these data, 4D8 Vk1.1×VH 1.4 was selected for further characterization and designated hz4D8 (Table 3). The humanized anti-TFPI antibody (hz4D8) was compared with the murine 4D8.B1 for activity in the FXa inhibition reversal assay, the two-stage TF-FVIIa-FX inhibition assay, and the thrombin generation assay. The data in Table 12 show that the humanized antibody had improved activity in all three assays compared with the mouse antibody, indicating that TFPI binding activity was fully retained in the humanized antibody.

TABLE 12 Comparison of 4D8.B1 and hz4D8 antibodies in the FXa and FXa-FVIIa inhibition reversal assays and the thrombin generation assay (TGA) FXa FXa-FVIIa TGA Velocity Antibody EC50 (nM) EC50 (nM) Index at 20 nM 4D8.B1 4.15 3.5 13.5 Hz4D8 1.87 1.57 15.7

Example 5 Generation of Additional Anti-TFPI Antibodies by Phage Display

1. Selection of Anti-TFPI Antibodies by Phage Display

Single chain fragment variable (scFv) antibodies that bind to the recombinant human and mouse TFPI K1K2 were identified following four rounds of selection using a phage display library of scFv antibody fragments derived from non-immunized human donors. Phage selections were performed in solution using streptavidin beads. Bound phage were eluted by incubation with 140 mM triethanolamine (TEA) pH 11.5 or 50 mM MES pH 5.5 for 10 min at room temperature on a rotary shaker and neutralized with 1M Tris-HCl, pH7.5.

The eluted phage pool was used to infect 10 mL of an E. coli ER2738 culture that had been grown to mid-logarithmic phase (corresponding to an OD₆₀₀ of approximately 0.5). Bacteria were infected with phage for 30 minutes at 37° C. without shaking, concentrated by centrifugation and plated, followed by overnight growth at 30° C. For the next round of selection, phages were rescued by inoculating 25 mL 2×TYAG/Tetracycline to an OD₆₀₀ of ˜0.1, grown at 37° C. to an OD600 of 0.3-0.5. Cells were super-infected with MK13K07 helper phage at 1:20 cell/helper phage ratio, and incubated at 37° C. without shaking for 30 minutes then shaking at 150 rpm for 60 minutes. The cells were then centrifuged and the pellet re-suspended in a kanamycin/non-glucose containing medium. This culture was grown overnight at 25° C. Phage were harvested in the supernatant following centrifugation and used in the next round of selection.

2. Preparation of Crude Periplasmic Material for Use in ELISA Assay.

ScFv antibody fragments can be expressed either on the surface of a phage particle or in solution in the bacterial periplasmic space, depending upon the growth conditions used. To induce release of scFv antibody fragments into the periplasm, 96-deepwell plates containing 2×TY media with 0.1% glucose/100 μg/mL ampicillin were inoculated from thawed glycerol stocks and grown at 37° C. for approximately 4 hours. The contents of the bacterial periplasm (peripreps) were released by osmotic shock. Plates were centrifuged and the scFv-containing supernatant was harvested.

3. ELISA to Measure Binding of scFvs Expressed in the Periplasm to Human and Mouse TFPI K1K2.

A total of 1984 clones were picked randomly from rounds 2, 3 and 4 of all the branch selections. TFPI scFv binders were identified by the periplasmic preparation (periprep) binding ELISA. Biotinylated human and mouse TFPI K1K2 were coated on 384-well Nunc Maxisorp streptavidin plates at a concentration of 1 μg/mL in PBS. The TFPI K1K2 solutions were removed and plates were blocked for 1 hour at room temperature in 0.05% Tween 20/1% BSA/PBS. Peripreps were prepared and blocked for 1 hour at room temperature in an equal volume of 6% milk/1% BSA. 20 μl/well of blocked periplasmic scFv and control antibodies were transferred to the appropriate plates and incubated for 1 hour at room temperature. A 1:2,000 dilution of anti-myc horseradish peroxidase (HRP) or a 1:10,000 dilution of goat anti-human-HRP secondary antibody was added to detect bound scFv or anti-TFPI control antibodies. The signal was developed using 3,3′,5,5′-Tetramethylbenzidine, with absorbance read at 450 nm on an Envision plate reader (Perkin Elmer). A total of 883 scFV clones were identified as TFPI binders. The 883 TFPI binding scFVs were sequenced to identify unique clones. 288 unique clones were chosen to test for TFPI/FXa competitive binding.

4. ELISA to Identify scFvs that Compete with FXa Binding to Human and Mouse TFPI K1K2.

A total of 288 unique clones were tested in an FXa/TFPI competitive binding ELISA. Human FXa was coated overnight on 384-well Nunc Maxisorp plates at a concentration of 1 μg/mL in PBS. The FXa solution was removed and the plate surface was blocked for 1 hour at room temperature in 0.05% Tween20/1% BSA/PBS. Peripreps were prepared and blocked for 1 hour at room temperature in an equal volume of 6% milk/1% BSA. 20 μl/well of blocked periplasmic scFv and control antibodies were mixed with biotinylated humTFPI K1K2 and allowed to incubate for 1 hour at room temperature. The mixture was transferred to the FXa coated plates and incubated for 1 hour at room temperature. A 1:2000 dilution of streptavidin-horseradish peroxidase was added to detect bound TFPI. The signal was developed using 3,3′,5,5′-Tetramethylbenzidine, with absorbance read at 450 nm on an Envision plate reader. A total of 48 scFV antibodies were classified as competitive inhibitors of TFPI/FXa binding.

5. ScFv Conversion to Human IgG.

A total of 48 ScFv antibodies with unique sequences that demonstrated binding to TFPI and inhibition in a TFPI/FXa competition ELISA were selected for sub-cloning into human IgG-3M cloning vectors. Briefly, fragments were amplified by standard PCR. The VH or VL fragments were gel purified and ligated into a mammalian expression vector containing either the human IgG1-3M (VH) or Kappa or Lambda constant region (VK/VL). The VH and VK/VL paired expression vectors were then used for transient mammalian expression and purification in HEK 293 cells.

6. Characterization of Human IgG-3M Anti-TFPI Antibodies

48 anti-TFPI antibodies were ranked in various assays including FXa and TF/FVIIa/FXa inhibition reversal assays. TFPI-3, TFPI-21, TFPI-23, TFPI-24 and TFPI-26 had the desirable properties such as TFPI cross species, low or no binding to humTFPI2 K1K2K3 (Table 13). The FXa and TF/FVIIa/FXa inhibition reversal assay data for these same 5 antibodies are shown in Table 14 and SPR binding data in Table 15.

TABLE 13 TFPI antibodies that showed binding to multiple TFPI species (human, monkey, murine, rabbit and rat) and no or weak binding to human TFPI2 Anti- humTFPI cynTFPI murTFPI rabTFPI ratTFPI humTFPI2 body K1K2 K1K2 K1K2 K1K2 K1K2 K1K2K3 TFPI- ++ ++ ++ ++ − − 3 TFPI- ++ ++ ++ ++ ++ − 21 TFPI- ++ ++ ++ ++ ++ − 23 TFPI- ++ ++ ++ ++ ++ +/− 24 TFPI- ++ ++ ++ ++ ++ − 26

TABLE 14 TFPI antibody activity in FXa, TF/FVIIa/FXa inhibition reversal and thrombin generation assays FXa FXa-FVIIa TGA Velocity Antibody EC50 (nM) EC50 (nM) Index at 20 nM TFPI-3 207.9 37.4 NT TFPI-21 80.64 54.1 24.71 TFPI-23 46 32.2 23.28 TFPI-24 23 9.3 23.21 TFPI-26 12.8 9.6 18.65

TABLE 15 TFPI antibody SPR binding kinetics to human and mouse TFPI Analyte Ligand k_(a) (1/Ms) k_(d)(1/s) K_(D) (nM) humTFPI K1K2 TFPI-3 6.25 × 10⁴  1.7 × 10⁻³ 27.05 humTFPI K1K2 TFPI-21 7.85 × 10⁵ 3.47 × 10⁻² 43.95 humTFPI K1K2 TFPI-23 9.18 × 10⁵ 9.71 × 10⁻³ 9.89 humTFPI K1K2 TFPI-24 1.59 × 10⁵ 8.62 × 10⁻⁴ 5.46 humTFPI K1K2 TFPI-26 2.05 × 10⁵ 1.18 × 10⁻³ 5.79 murTFPI K1K2 TFPI-3 2.15 × 10⁵ 8.24 × 10⁻⁴ 3.81 murTFPI K1K2 TFPI-21 1.73 × 10⁶ 7.71 × 10⁻³ 4.54 murTFPI K1K2 TFPI-23 1.69 × 10⁶ 2.48 × 10⁻³ 1.46 murTFPI K1K2 TFPI-24 2.48 × 10⁵ 5.96 × 10⁻³ 24.1 murTFPI K1K2 TFPI-26 1.29 × 10⁶ 4.76 × 10⁻³ 3.68

Example 6 Epitope Mapping of Anti-TFPI Antibodies by SPR

A sandwich SPR assay was used to map the epitopes of the anti-TFPI antibodies discovered and disclosed in this document (TFPI-21, TFPI-23, TFPI-24, 4D8, 6B7.c5 and 7A4.D9). Other known reference antibodies (hz4F36, 2A8-200 and Mab2974) were also included in the epitope mapping experiment. Antibody 1 was immobilized on a CM5 biacore chip using NHS chemistry. Human TFPI (humTFPI K1K2) was initially injected onto the chip until binding was near apparent equilibrium. Immediately after stopping human TFPI injection, antibody 2 was injected over the chip. If antibody 2 binds the complex of antibody 1 and human TFPI on the surface of the CM5 chip, then antibody 2 has a distinct and non-overlapping TFPI binding epitope versus antibody 1 (scored as +). If antibody 2 shows no binding, then it is scored as a significantly overlapping epitope (negative (−)) versus antibody 1. If antibody 2 shows weak binding then antibodies 1 and 2 are deemed to have some partial overlap in TFPI epitopes (scored as +/−). As shown in Table 16, TFPI-21 and TFPI-23 have similar epitopes and the data also show that TFPI-21 and TFPI-23 have epitopes that are completely distinct from mab2974 and hz4F36.

TABLE 16 Epitope mapping of anti-TFPI antibodies using an SPR sandwhich assay Antibody 2 Antibody 1 TFPI-21 TFPI-23 TFPI-24 hz4F36 2A8-200 Mab2479 4D8.b1 6B7.c5 7A4.D9 TFPI-21 − − − + − + + + − TFPI-23 − − − + − + + + − TFPI-24 − − − − − − − − − hz4F36 + + − − − − − − − 2A8-200 − − − − − − − − − Mab2479 + + − − − − − − +/− 4D8.b1 + + − − − − − − + 6B7.c5 + + − − − − − − + 7A4.D9 − − − − − +/− + + − Antibody 1 was immobilized on the surface of a CM5 chip. Human TFPI (humTFPI K1K2) was then injected onto the surface until the measurement was close to apparent equilibrium. Immediately after stopping TFPI injection, antibody 2 was injected to measure the binding to the antibody 1/TFPI complex. A “+” score is given to antibody 1 and 2 parings that have completely distinct epitopes. A “−” score is given to antibody pairings that have strongly overlapping epitopes. If antibody 2 shows weak binding then antibodies 1 and 2 are deemed to have some partial overlap in TFPI epitopes (scored as +/−).

Example 7 Germlining Human Frameworks of TFPI-23 Antibody

Two variants of TFPI-23 were made to increase the content of human framework germline residues. TFPI-106 contains H1Q to E and H5V to L mutations (Kabat numbering) and TFPI-107 (Tables 3 and 4), contained H1Q to E, H5V to L and H941 to K mutations (Kabat numbering). TFPI-106, TFPI-107, and TFPI-23, were expressed, purified, and tested for binding to humTFPI K1K2 by SPR. The data in Table 17 show that when compared to the TFPI-23 parental antibody, TFPI-106 germline variant retained full binding affinity.

TABLE 17 TFPI-23 human frameworks germline variants SPR binding kinetics to human TFPI Analyte Ligand k_(a) (1/Ms) k_(d) (1/s) K_(D) (nM) humTFPI K1K2 TFPI-23 9.18 × 10⁵ 9.71 × 10⁻³ 9.89 humTFPI K1K2 TFPI-106 2.72 × 10⁶ 9.74 × 10⁻³ 3.7 humTFPI K1K2 TFPI-107 — — No binding TFPI-106 showed a modest improvement in binding when compared to the parental TFPI-23 antibody.

Example 8 Germlining Human Frameworks of TFPI-24 Antibody

Four TFPI-24 VL variants were made (TFPI-110, TFPI-111, TFPI-112, TFPI-113) and paired with the TFPI-24 VH sequence. Three TFPI-24 VH variants were made (TFPI-108, TFPI-109, TFPI-114) were made and paired with the TFPI-24 VL sequence. Based on these data, the best VL variant, TFPI-113, and the best VH variant, TFPI-108 were paired to produce antibody TFPI-118. TFPI-118 and TFPI-24 were tested for binding to human TFPI by SPR and the results in Table 18 show comparable binding kinetics.

TABLE 18 The binding kenetics of TFPI-24 and human frameworks variant TFPI-118 to human TFPI were compared using SPR Analyte Ligand k_(a) (1/Ms) k_(d) (1/s) K_(D) (nM) humTFPI K1K2 TFPI-24 9.18 × 10⁵ 9.71 × 10⁻³ 3.68 humTFPI K1K2 TFPI-118 1.25 × 10⁵ 1.19 × 10⁻³ 9.61 TFPI-118 showed comparable binding kinetics to the parental TFPI-23 antibody.

Example 9 SPR Binding Kinetics of Anti-TFPI Antibodies to TFPI from Various Species

Anti-TFPI antibodies (TFPI-106, TFPI-118, and hz4F36) were analysed by SPR to determine the binding kinetics to TFPI from different animal species (human (huTFPI K1K2), cynomolgus monkey (cynTFPI K1K2), rabbit (rabTFPI K1K2), mouse (murTFPI K1K2) and rat (ratTFPI K1K2); Table 1). Three comparitor antibodies (hz4F36, 2A8 and 2A8-200) were also included in this experiment.

TABLE 19 Anti-TFPI antibody SPR binding kinetics to human, cyno, rabbit, rat and mouse TFPI (The K_(d) values are means from 2 experiments) Analyte Ligand k_(a) (1/Ms) k_(d) (1/s) K_(D) (nM) humTFPI K1K2 TFPI-106 2.72 × 10⁶ 9.74 × 10⁻³ 3.7 humTFPI K1K2 TFPI-118 1.25 × 10⁵ 1.19 × 10⁻³ 9.61 humTFPI K1K2 hz4D8 3.16 × 10⁶ 1.32 × 10⁻³ 0.42 humTFPI K1K2 hz4F36 1.89 × 10⁶ 9.30 × 10⁻⁴ 0.49 humTFPI K1K2 2A8 3.55 × 10⁵ 3.77 × 10⁻³ 10.6 humTFPI K1K2 2A8-200 1.16 × 10⁶ 3.81 × 10⁻³ 0.327 cynTFPI K1K2 TFPI-106 6.55 × 10⁶ 8.01 × 10⁻³ 1.22 cynTFPI K1K2 TFPI-118 7.21 × 10⁵ 1.27 × 10⁻³ 1.8 cynTFPI K1K2 hz4D8 2.93 × 10⁷ 1.95 × 10⁻³ 0.067 cynTFPI K1K2 hz4F36 6.86 × 10⁶ 2.88 × 10⁻³ 0.425 cynTFPI K1K2 2A8 2.37 × 10⁵ 3.06 × 10⁻² 13.25 cynTFPI K1K2 2A8-200 1.25 × 10⁶ 8.09 × 10⁻⁴ 0.637 rabTFPI K1K2 TFPI-106 3.66 × 10⁶ 1.55 × 10⁻² 4.25 rabTFPI K1K2 TFPI-118 2.01 × 10⁵ 1.55 × 10⁻² 5.79 rabTFPI K1K2 hz4D8 3.16 × 10⁶  2.9 × 10⁻³ 0.502 rabTFPI K1K2 hz4F36  4.2 × 10⁶  7.6 × 10⁻³ 1.81 rabTFPI K1K2 2A8  7.3 × 10⁵ 1.23 × 10⁻³ 1.69 rabTFPI K1K2 2A8-200 1.92 × 10⁶ 2.77 × 10⁻⁴ 0.145 murTFPI K1K2 TFPI-106 4.05 × 10⁶ 2.32 × 10⁻³ 0.575 murTFPI K1K2 TFPI-118 2.19 × 10⁵ 9.82 × 10⁻³ 45.6 murTFPI K1K2 hz4D8 — — No binding murTFPI K1K2 hz4F36 — — No binding murTFPI K1K2 2A8 1.91 × 10⁵ 6.32 × 10⁻³ 33.65 murTFPI K1K2 2A8-200 2.54 × 10⁶ 1.17 × 10⁻³ 0.455 ratTFPI K1K2 TFPI-106 3.01 × 10⁶ 4.71 × 10⁻³ 1.57 ratTFPI K1K2 TFPI-118 4.83 × 10⁵ 1.75 × 10⁻³ 3.65 ratTFPI K1K2 hz4D8 — — No binding ratTFPI K1K2 hz4F36 — — No binding ratTFPI K1K2 2A8 — — Not tested ratTFPI K1K2 2A8-200 — — Not tested

Example 10 Anti-TFPI Antibody/TFPI Complex Structures

1. 4D8.b1 Fab/Cyno TFPI K2 Complex Structure

The 4D8.b1 Fab and cyno TFPI K2 were mixed at a 1:1 molar ratio to form the complex. Final purification was performed using a Superdex 200 column. The complex was concentrated to 12.6 mg/ml for structural studies. Crystals of the TFPI K2+4D8 Fab complex were obtained in 100 mM Tris-HCl pH8.5, 20% PEG10000. It yielded rod-shaped crystals that diffracted to 2.9 A. Crystals were transiently cryo-protected and synchrotron data collection was performed remotely at Advanced Photon Source. Image frames were processed using software AutoPROC (Global Phasing Ltd). The data belongs to space group P212121, with unit cells as follows: a=62.102 Å, b=82.284 Å, c=103.628 Å, α=β=γ=90°, with one complex per asymmetric unit. Molecular Replacement searches using homology models of 4D8 Fab as well as publicly available structures (RSCB Protein Data Bank; PDB codes 1TFX and 4DTG) of TFPI K2 domains yielded convincing solutions of each component. Refinement was performed using software autoBUSTER (Global Phasing Ltd), and the final R/Rfree factors at 2.9 Å are 0.1707 and 0.2424, respectively, with RMSD of bond 0.010 Å, RMSD of angles 1.26°. Based on buried surface area (BSA) and percent BSA (% BSA) for residues at the Fab/TFPI K2 interface, the epitope and paratope of the 4D8 Fab were determined. The following residues in K2 domain of TFPI are involved in direct contact with 4D8 Fab (epitope according to BSA): E101, P103, Y109, I110, T111, Y113, F114, S119, Q121, C122, E123, R124, F125, K126, and L140. The following residues in heavy chain of 4D8 Fab comprise the heavy chain paratope: D50, T57, L58, Y59, Q61, K64, D98, Y99, and D100. The following residues in light chain of 4D8 Fab comprise the light chain paratope: H30, W50, H91, Y92, T93, T94, P95, and Y96. The BSA and % BSA values for the epitope and paratope residues are shown in table 20.

TABLE 20 Anti-TFPI antibody 4D8.b1 epitope and paratope residues as defined by buried surface area (BSA) and percent BSA (% BSA) of the interface residues in the 4D8.b1 Fab/cyno TFPI K2 complex structure (Antibody light chain (LC) and heavy chain (HC) residues are numbered using Kabat definitions). A cutoff (BSA of 20 Å² or greater, or involved in electrostatic interaction) is applied in BSA analysis. Residue Chain Residue # Classification BSA % BSA GLU TFPIK2 101 epitope 33.93 48.73 PRO TFPIK2 103 epitope 34.91 74.82 TYR TFPIK2 109 epitope 71.54 55.15 THR TFPIK2 111 epitope 41.72 66.65 SER TFPIK2 119 epitope 32.89 65.61 GLN TFPIK2 121 epitope 67.99 86.51 GLU TFPIK2 123 epitope 63.53 99.15 ARG TFPIK2 124 epitope 147.09 97.31 LYS TFPIK2 126 epitope 114.72 95.85 LEU TFPIK2 140 epitope 41.62 60.14 ASP 4D8.b1 HC 50 paratope 5.98 52.56 THR 4D8.b1 HC 57 paratope 26.48 42.04 LEU 4D8.b1 HC 58 paratope 72.95 93.41 TYR 4D8.b1 HC 59 paratope 15.75 33.75 GLN 4D8.b1 HC 61 paratope 59.14 45.41 ASP 4D8.b1 HC 98 paratope 62.87 50.71 TYR 4D8.b1 HC 99 paratope 44.28 59.06 ASP 4D8.b1 HC 100 paratope 5.83 27.84 HIS 4D8.b1 LC 30 paratope 53.18 56.60 TRP 4D8.b1 LC 50 paratope 53.41 51.52 TYR 4D8.b1 LC 92 paratope 97.99 96.61 THR 4D8.b1 LC 93 paratope 39.89 73.42 THR 4D8.b1 LC 94 paratope 48.00 95.74 TYR 4D8.b1 LC 96 paratope 15.49 72.23

2. 2A8 & 2A8-200 Fab/Cyno K1K2 Complex Structures

The 2A8 Fab and cyno TFPI K1K2 were mixed at a 1:1 molar ratio to form the complex. Final purification was performed using a Superdex 200 column. The complex was concentrated to 10.8 mg/ml for structural studies. Crystals of the complex containing 2A8 Fab and TFPI K1K2 were obtained in the following two conditions: (1) 100 mM HEPES pH7.5, 12.5% PEG8000, which yielded needle-shaped crystals that diffracted to 3.0 A; (2) 100 mM HEPES pH 7.5, 1600 mM Ammonium Sulfate, 2% PEG1000, which yielded block-shaped crystals that diffracted to 3.3 A. Crystals were transiently cryo-protected and synchrotron data collection was performed remotely at Advanced Photon Source. Image frames were processed using software AutoPROC (Global Phasing Ltd). The data belongs to space group P3221, with unit cells as follows: a=b=196.146 Å, c=41.262 Å, α=β=90°, γ=120°, with one complex per asymmetric unit. Molecular Replacement searches using homology models of 2A8 Fab as well as publicly available structures (RSCB Protein Data Bank; PDB codes 1TFX and 4DTG) of TFPI K2 domains yielded convincing solutions of each component. Refinement was performed using software PHENIX, and the final R/Rfree factors at 3.0 Å are 0.1667 and 0.2088, respectively, with RMSD of bond 0.011 Å, RMSD of angles 1.474°. Based on buried surface area (BSA) and percent BSA (% BSA) for residues at the Fab TFPI K1K2 interface, the epitope and paratope of the complex were determined. The following residues in TFPI K1K2 domains of TFPI are involved in direct contact with 2A8 Fab (epitope according to BSA): D31, D32, G33, P34, C35, K36, E100, E101, P103, G104, 1105, C106, R107, G108, Y109, E123, K126, Y127 and G128. The following residues in heavy chain of 4D8 Fab comprise the heavy chain paratope: G26, T28, S31, Y32, Y96, R97, Y98, W99 and D101 (Kabat numbering). The following residues in the light chain of 2A8 Fab comprise the light chain paratope: L28, R29, N30, Y31, Y32, Y49, Y50, D51 and N66 (Kabat numbering). The BSA and % BSA values for the epitope and paratope residues are shown in table 21. The very closely related antibody, 2A8-200, was also solved in complex with TFPI K1K2 using essentially identical methods. The epitope and paratope of this antibody was identical to that of 2A8.

TABLE 21 Anti-TFPI antibody 2A8 epitope and paratope residues as defined by buried surface area (BSA) and percent BSA (% BSA) of the interface residues in the 2A8 Fab/cyno TFPI K2 complex structure (Antibody light chain (LC) and heavy chain (HC) residues are numbered using Kabat definitions). A cutoff (BSA of 20 Å² or greater, or involved in electrostatic interaction) is applied in BSA analysis. Residue Chain Residue # Classification BSA % BSA ASP TFPI K1K2 31 epitope 41.9 59.8 ASP TFPI K1K2 32 epitope 4.9 44.0 PRO TFPI K1K2 34 epitope 98.8 88.7 CYS TFPI K1K2 35 epitope 40.5 91.8 LYS TFPI K1K2 36 epitope 143.6 73.4 GLU TFPI K1K2 100 epitope 47.6 35.6 GLU TFPI K1K2 101 epitope 90.2 90.7 PRO TFPI K1K2 103 epitope 56.8 79.2 ILE TFPI K1K2 105 epitope 9.3 39.1 ARG TFPI K1K2 107 epitope 111.0 71.3 GLY TFPI K1K2 108 epitope 20.5 55.8 TYR TFPI K1K2 109 epitope 128.1 79.1 GLU TFPI K1K2 123 epitope 26.5 43.0 LYS TFPI K1K2 126 epitope 49.3 60.2 TYR TFPI K1K2 127 epitope 1.5 9.0 GLY TFPI K1K2 128 epitope 3.2 47.7 GLY 2A8 HC 26 paratope 29.3 46.5 THR 2A8 HC 28 paratope 61.6 74.1 SER 2A8 HC 31 paratope 46.5 56.7 TYR 2A8 HC 32 paratope 54.2 85.6 TYR 2A8 HC 96 paratope 85.7 99.1 ARG 2A8 HC 97 paratope 104.4 78.6 TYR 2A8 HC 98 paratope 89.3 81.3 TRP 2A8 HC 99 paratope 20.0 96.7 ASP 2A8 HC 101 paratope 16.5 51.6 LEU 2A8 LC 28 paratope 7.4 67.0 ASN 2A8 LC 30 paratope 43.4 38.7 TYR 2A8 LC 31 paratope 49.6 58.2 TYR 2A8 LC 32 paratope 94.8 72.8 TYR 2A8 LC 49 paratope 43.0 79.4 TYR 2A8 LC 50 paratope 41.2 92.9 ASP 2A8 LC 51 paratope 15.7 64.4

3. Mab 2974 Fab/TFPI K2 Complex Structure

The Mab 2974 (R&D Systems) Fab and cyno TFPI K2 were mixed at a 1:1.2 molar ratio to form the complex. Final purification was performed using a Superdex 200 column. The complex was concentrated to 17.5 mg/ml for structural studies. Crystals of the complex containing Mab 2974 Fab and TFPI K2 were obtained in 100 mM Sodium Citrate pH 5.6, 20% isopropanol, 20% PEG4000, which yielded block-shaped crystals that diffracted to 2.15 A. Crystals were transiently cryo-protected and synchrotron data collection was performed remotely at Advanced Photon Source. Image frames were processed using software AutoPROC (Global Phasing Ltd). The data of the complex belongs to space group P212121, with unit cells as follows: a=82.075 Å b=117.829 Å, c=170.945 Å, α=β=γ=90°, with three complexes per asymmetric unit. Since the sequence of Mab 2947 Fab was not available, a high-resolution data set of the Fab alone (1.63 Å) was collected, along with bioinformatics analysis, to decipher the protein sequence. Molecular Replacement searches using the structure of Mab 2974 Fab as well as publicly available structures (RSCB Protein Data Bank; PDB codes 1TFX and 4DTG) of TFPI K2 domains yielded convincing solutions of each component. Refinement was performed using software autoBUSTER, and the final R/Rfree factors at 2.15 Å are 0.1702 and 0.2161, respectively, with RMSD of bond 0.010 Å, RMSD of angles 1.13°. Based on buried surface area (BSA) and percent BSA (% BSA) for residues at the Fab TFPI K2 interface, the epitope of the complex was determined. The following residues in TFPI K2 domain of TFPI are involved in direct contact with Mab 2974 Fab (epitope according to BSA): E100, E101, P103, R107, Y109, T111, N116, Q118, S119, Q121, E123, R124, F125 and K126. The BSA and % BSA values for the epitope residues are shown in table 22.

TABLE 22 Anti-TFPI antibody Mab 2974 epitope residues as defined by buried surface area (BSA) and percent BSA (% BSA) of the interface residues in the Mab 2974 Fab/cyno TFPI K2 complex structure. A cutoff (BSA of 20 Å² or greater, or involved in electrostatic interaction) is applied in BSA analysis. Residue Chain Residue # Classification BSA % BSA GLU TFPI K2 100 epitope 25.9 16.8 GLU TFPI K2 101 epitope 42.2 54.7 PRO TFPI K2 103 epitope 26.8 58.5 ARG TFPI K2 107 epitope 32.3 16.4 TYR TFPI K2 109 epitope 83.1 62.9 THR TFPI K2 111 epitope 13.8 18.9 ASN TFPI K2 116 epitope 23.9 71.9 GLN TFPI K2 118 epitope 107.0 62.7 SER TFPI K2 119 epitope 48.4 87.6 GLN TFPI K2 121 epitope 51.6 53.3 GLU TFPI K2 123 epitope 61.6 79.8 ARG TFPI K2 124 epitope 56.0 33.2 LYS TFPI K2 126 epitope 114.8 91.8

4. TFPI-23 Fab/Cyno TFPI K2 Complex Structure

The TFPI-23 Fab and cyno TFPI K2 were mixed at a 1:2 molar ratio to form the complex. Final purification was performed using a Superdex 200 column. The complex was concentrated to 12.4 mg/ml for structural studies. Crystals of the TFPI K2+4D8 Fab complex were obtained in 100 mM Bis-Tris pH6.5, 20% PEGMME5000. It yielded fiber-shaped crystals that diffracted to 2.9 Å. Crystals were transiently cryo-protected and synchrotron data collection was performed remotely at Advanced Photon Source. Image frames were processed using software AutoPROC (Global Phasing Ltd). The data belongs to space group P1, with unit cells as follows: a=74.669 Å, b=101.372 Å, c=119.275 Å, α=101.83, β=92.27°, γ=96.78°, with six copies of complex per asymmetric unit. Molecular Replacement searches using homology models of TFPI-23 Fab as well as publicly available structures (RSCB Protein Data Bank; PDB codes 1TFX and 4DTG) of TFPI K2 domains yielded convincing solutions of each component. Refinement was performed using software autoBUSTER, and the final R/Rfree factors at 2.9 Å are 0.1961 and 0.2344, respectively, with RMSD of bond 0.010 Å, RMSD of angles 1.22°. Based on BSA and percent BSA (% BSA) for residues at the Fab TFPI K2 interface, the epitope and paratope of the complex were determined. The following residues in K2 domain of TFPI are involved in direct contact with the TFPI-23 Fab (epitope according to BSA): D102, I105, C106, R107, G108, R112, Y127, G129, C130, L131, G132, M134 and E138. The following residues in heavy chain of 4D8 Fab comprise the heavy chain paratope: A33, W47, A50, 151, S52, S56, Y58, L95, G96, A97, T98, S99, L100 and S100A. The following residues in light chain of 4D8 Fab comprise the light chain paratope: A29, Y31, Y91, S95A, G95B and S95C. The BSA and % BSA values for the epitope and paratope residues are shown in table 23.

TABLE 23 Anti-TFPI antibody TFPI-23 epitope and paratope residues as defined by buried surface area (BSA) and percent BSA (% BSA) of the interface residues in the TFPI-23 Fab/cyno TFPI K2 complex structure (Antibody light chain (LC) and heavy chain (HC) residues are numbered using Kabat definitions). A cutoff (BSA of 20 Å² or greater, or involved in electrostatic interaction) is applied in BSA analysis. Residue Chain Residue # Classification BSA % BSA ASP TFPI K2 102 epitope 27.4 49.2 ILE TFPI K2 105 epitope 116.0 81.9 CYS TFPI K2 106 epitope 46.8 97.0 ARG TFPI K2 107 epitope 99.9 49.5 GLY TFPI K2 108 epitope 23.1 45.7 ARG TFPI K2 112 epitope 42.8 70.4 TYR TFPI K2 127 epitope 18.7 92.6 GLY TFPI K2 129 epitope 36.7 69.5 CYS TFPI K2 130 epitope 26.7 100.0 LEU TFPI K2 131 epitope 120.8 97.5 GLY TFPI K2 132 epitope 29.3 77.8 MET TFPI K2 134 epitope 48.7 38.2 GLU TFPI K2 138 epitope 43.8 31.7 ALA TFPI-23 HC  33 paratope 20.3 70.5 TYR TFPI-23 HC  58 paratope 107.0 82.7 LEU TFPI-23 HC  95 paratope 31.6 93.4 GLY TFPI-23 HC  96 paratope 20.8 73.1 ALA TFPI-23 HC  97 paratope 12.1 34.0 THR TFPI-23 HC  98 paratope 5.6 4.9 SER TFPI-23 HC  99 paratope 2.4 80.7 LEU TFPI-23 HC 100 paratope 87.0 55.9 SER TFPI-23 HC 100A paratope 24.7 83.8 ALA TFPI-23 LC  29 paratope 38.7 86.9 TYR TFPI-23 LC  31 paratope 60.8 86.0 TYR TFPI-23 LC  91 paratope 27.0 94.3 SER TFPI-23 LC  95A paratope 71.4 64.9 GLY TFPI-23 LC  95B paratope 25.3 96.5

5. TFPI-24 Fab/Cyno TFPI K2 Complex Structure

The TFPI-24 Fab and cyno TFPI K2 were mixed at a 1:2 molar ratio to form the complex. Final purification was performed using a Superdex 200 column. The complex was concentrated to 12.2 mg/ml for structural studies. Crystals of the TFPI K2/TFPI-24 Fab complex were obtained in 20% PEG3350, 200 mM Ammonium Nitrate. It yielded crystals that diffracted to 1.75 Å. Crystals were transiently cryo-protected and synchrotron data collection was performed remotely at Advanced Photon Source. Image frames were processed using software AutoPROC. The data belongs to space group P212121, with unit cells as follows: a=42.817 Å, b=71.362 Å, c=148.729 Å, α=β=γ=90°, with one complex per asymmetric unit. Molecular Replacement searches using homology models of TFPI-24 Fab as well as publicly available structures (RSCB Protein Data Bank; PDB codes 1TFX and 4DTG) of TFPI K2 domains yielded convincing solutions of each component. Refinement was performed using software autoBUSTER, and the final R/Rfree factors at 1.75 Å are 0.1900 and 0.2269, respectively, with RMSD of bond 0.010 Å, RMSD of angles 1.18°. Based on buried surface area (BSA) and percent BSA (% BSA) for residues at the Fab/TFPI K2 interface, the epitope and paratope of the complex were determined. The following residues in K2 domain of TFPI are involved in direct contact with the TFPI-24 Fab (epitope according to BSA): E100, E101, D102, G104, 1105, C106, R107, G108, Y109, I110, G129, C130, L131 and G132. The following residues in heavy chain of TFPI-24 Fab comprise the heavy chain paratope: A33, Q35, W47, G50, I51, S52, N53, R55, S56, I57, G58, F95, L96, H97, S99 and D101. The following residues in light chain of TFPI-24 Fab comprise the light chain paratope: M31, Y32, H34, Y36, L46, R50, W91 and Y96. The BSA and % BSA values for the epitope and paratope residues are shown in table 24.

TABLE 24 Anti-TFPI antibody TFPI-24 epitope and paratope residues as defined by buried surface area (BSA) and percent BSA (% BSA) of the interface residues in the TFPI-24 Fab/cyno TFPI K2 complex structure (Antibody light chain (LC) and heavy chain (HC) residues are numbered using Kabat definitions). A cutoff (BSA of 20 Å² or greater, or involved in electrostatic interaction) is applied in BSA analysis. Residue Chain Residue # Classification BSA % BSA GLU TFPI K2 100 epitope 44.1 30.0 GLU TFPI K2 101 epitope 12.3 13.7 ASP TFPI K2 102 epitope 57.1 93.5 GLY TFPI K2 104 epitope 22.0 84.1 ILE TFPI K2 105 epitope 137.7 99.1 CYS TFPI K2 106 epitope 45.2 91.5 ARG TFPI K2 107 epitope 202.7 99.7 GLY TFPI K2 108 epitope 33.1 79.3 TYR TFPI K2 109 epitope 106.1 76.3 CYS TFPI K2 130 epitope 25.1 83.9 LEU TFPI K2 131 epitope 66.8 54.9 GLY TFPI K2 132 epitope 4.7 14.4 ALA TFPI-24 HC 33 paratope 33.1 74.0 GLN TFPI-24 HC 35 paratope 14.3 95.5 SER TFPI-24 HC 52 paratope 26.3 99.3 ASN TFPI-24 HC 53 paratope 54.6 52.6 ARG TFPI-24 HC 55 paratope 22.0 11.0 SER TFPI-24 HC 56 paratope 68.7 93.5 PHE TFPI-24 HC 95 paratope 47.2 92.9 LEU TFPI-24 HC 96 paratope 18.4 41.5 HIS TFPI-24 HC 97 paratope 70.9 44.2 SER TFPI-24 HC 99 paratope 1.0 2.1 ASP TFPI-24 HC 101 paratope 3.7 11.6 MET TFPI-24 LC 31 paratope 30.9 46.0 TYR TFPI-24 LC 32 paratope 23.3 22.5 HIS TFPI-24 LC 34 paratope 23.7 85.2 TYR TFPI-24 LC 36 paratope 4.3 96.5 ARG TFPI-24 LC 50 paratope 62.5 60.1 TRP TFPI-24 LC 91 paratope 58.3 85.6 TYR TFPI-24 LC 96 paratope 43.2 78.5

6. Epitope Analysis of hz4F36

The structure of the hz4F36 fab in complex with the human TFPI K2 domain is available at the Protein Data Bank (PDB accession code 4DTG). Based on BSA and percent BSA (% BSA) of the interface residues in the hz4F36/TFPI K2 complex structure the epitope residues were defined as shown in Table 25.

TABLE 25 Anti-TFPI antibody hz4F36 epitope residues as defined by buried surface area (BSA) and percent BSA (% BSA) of the interface residues in the hz4F36 Fab/cyno TFPI K2 complex structure (PDB accession code 4DTG). A cutoff (BSA of 20 Å² or greater, or involved in electrostatic interaction) is applied in BSA analysis. Residue Chain Residue # Classification BSA % BSA GLU TFPI K2 100 epitope 103.9 72.9 GLU TFPI K2 101 epitope 44.4 68.0 ASP TFPI K2 102 epitope 31.9 55.3 PRO TFPI K2 103 epitope 45.7 91.7 ARG TFPI K2 107 epitope 105.0 55.8 TYR TFPI K2 109 epitope 75.9 67.4 THR TFPI K2 111 epitope 24.1 51.5 TYR TFPI K2 113 epitope 51.9 100.0 ASN TFPI K2 116 epitope 17.6 63.0 GLN TFPI K2 118 epitope 76.6 34.8 GLN TFPI K2 121 epitope 43.5 50.3 GLU TFPI K2 123 epitope 27.3 63.6 ARG TFPI K2 124 epitope 129.9 80.9 LYS TFPI K2 126 epitope 60.8 63.6 LEU TFPI K2 140 epitope 33.4 61.9

7. Comparison of Anti-TFPI Antibody Epitopes

The anti-TFPI antibody epitopes shown in Tables 20-25 are compared in Tables 26 and 27. Table 26 shows the epitopes of antibodies that are specific for the TFPI K2 domain. Table 27 includes 2 additional antibodies (2A8 and 2A8-200) that bind both K1 and K2 domains.

TABLE 26 Anti-TFPI antibody epitope residues based on the data in Tables 20, 22-25 Human TFPI Mab TFPI residues domain TFPI-24 TFPI-23 4D8.b1 hz4F36 2974 E100 K2 X X X E101 K2 X X X X D102 K2 X X X P103 K2 X X X G104 K2 X I105 K2 X X C106 K2 X X R107 K2 X X X X G108 K2 X X Y109 K2 X X X X I110 K2 T111 K2 X X X R112 K2 X Y113 K2 X F114 K2 Y115 K2 N116 K2 X X N117 K2 Q118 K2 X X S119 K2 X X K120 K2 Q121 K2 X X X C122 K2 E123 K2 X X X R124 K2 X X X F125 K2 K126 K2 X X X Y127 K2 X G128 K2 G129 K2 X C130 K2 X X L131 K2 X X G132 K2 X X N133 K2 M134 K2 X N135 K2 N136 K2 F137 K2 E138 K2 X T139 K2 L140 K2 X X E141 K2 X denotes TFPI amino acid residues that are part of the epitope. X (bold) denotes novel epitope residues for antibodies disclosed in this invention. Note that TFPI-23 does not compete for binding TFPI with hz4F36, 4D8 or mab2974 but does compete with TFPI-24 for binding to TFPI. Antibodies 2A8 and 2A8-200 are not included in this table since they require both K1 & K2 domains for binding and do not bind K2 domain alone.

TABLE 27 A comparison of anti-TFPI antibody epitope residues based on the data shown in Tables 20-25 Human TFPI TFPI do- TFPI- TFPI- 2A8- residues main 24 23 4D8 hz4F36 R&D2974 2A8 200 D31 K1 X X D32 K1 X X G33 K1 P34 K1 X X C35 K1 X X K36 K1 X X C59 K1 E100 K2 X X X X X E101 K2 X X X X X X D102 K2 X X X P103 K2 X X X X X G104 K2 X I105 K2 X X X X C106 K2 X X R107 K2 X X X X X X G108 K2 X X X X Y109 K2 X X X X X X I110 K2 T111 K2 X X X R112 K2 X Y113 K2 X F114 K2 Y115 K2 N116 K2 X X N117 K2 Q118 K2 X X S119 K2 X X K120 K2 Q121 K2 X X X C122 K2 E123 K2 X X X R124 K2 X X X F125 K2 K126 K2 X X X X X Y127 K2 X X X G128 K2 X X G129 K2 X C130 K2 X X L131 K2 X X G132 K2 X X N133 K2 M134 K2 X N135 K2 N136 K2 F137 K2 E138 K2 X T139 K2 L140 K2 X X E141 K2 X denotes TFPI amino acid residues that are part of the epitope. X (bold) denotes novel epitope residues for antibodies disclosed in this invention. Antibodies 2A8 and 2A8-200 require both K1 & K2 domains for binding and do not bind K2 or K1 domain alone.

TABLE 28 Prediction of key TFPI epitope residues for TFPI-23 by alanine scanning using computational methods (Accelrys Discovery Studio 4.1) Mutation Energy Electrostatic Epitope Mutation (kcal/mol) Effect of Mutation VDW Term Term Entropy Term ASP102 > ALA 0.73 NEUTRAL 1.56 0.37 −0.3 GLY104 > ALA −0.19 NEUTRAL −0.25 −0.13 0 ILE105 > ALA 2.19 DESTABILIZING 5.28 −0.05 −0.53 CYS106 > ALA 0.43 NEUTRAL 0.96 −0.01 −0.05 ARG107 > ALA 2.63 DESTABILIZING 7.35 0.35 −1.52 GLY108 > ALA 0.3 NEUTRAL 0.74 −0.02 −0.08 ARG112 > ALA −0.07 NEUTRAL 0.05 −0.18 0 TYR127 > ALA 0.12 NEUTRAL 0.18 0.07 0 GLY129 > ALA −0.33 NEUTRAL −0.35 −0.19 −0.08 CY5130 > ALA 0.06 NEUTRAL 0.26 −0.08 −0.04 LEU131 > ALA 2.12 DESTABILIZING 4.15 0.03 0.04 GLY132 > ALA −0.06 NEUTRAL −0.08 −0.04 0 MET134 > ALA 0.02 NEUTRAL 0.05 −0.01 0 GLU138 > ALA 0.07 NEUTRAL 0.02 0.13 0 Based on an arbitrary threshold of >1 kcal/mol, 3 TFPI residues (Ile105, Arg107 and Leu131), when mutated to alanine, are predicted to contribute significantly to binding of TFPI-23 to TFPI.

TABLE 29A TFPI-23 CDR and framework residues within 4 angstroms of the TFPI K2 epitope Column 2 Column 4 Column 5 Column 6 Column 1 TFPI-23 Potential Substitutions Corresponding CDR/paratope Column 3 <−0.5 kcal/mol TFPI residues residues CDR/Frameworks <0.5 kcal/mol affinity affinity Top 3 105 Ile H33 Ala VH1 Asn, Gly, His, Lys, Val Val, His, Met, Phe, Pro, Ser, Phe Thr, Trp, Val 131 Leu H47 Trp HFR2 Tyr none Tyr 105 Ile, 131 H50 Ala VH2 Arg, Gly, Lys, Met, none Thr, Ser, Leu Phe, Pro, Ser, Thr, Phe Tyr, Val 105 Ile H51 Ile VH2 Ala, Arg, Asn Asp, none Arg, Lys, Gln, Glu, Gly, His, Pro Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, Val 105 Ile H52 Ser VH2 Ala, Arg, Asn, Asp, Arg, Lys, Phe, Phe, Arg, Gln, Glu, Gly His, Ile, Tyr Tyr Leu, Lys, Met, Phe, Pro, Ser, Trp, Tyr, Val 105 Ile H56 Ser VH2 Arg, Gly, His, Ile, Leu, Arg, Lys Lys, Tyr, Lys, Met, Phe, Pro, Phe Ser, Thr, Trp, Tyr, Val 102 Asp, 104 H58 Tyr VH2 none none none Gly, 105 Ile, 131 Leu, 132 Gly 105 Ile H95 Leu VH3 Gln, Ile, Phe, Tyr none Ile, Gln, Phe 107 Arg H96 Gly VH3 Ala, Arg, Asn Asp, Ala, Arg, Asn, Arg, Asn, Gln, Ile, Lys, Met, Phe, Lys, Pro, Ser, Lys Pro, Ser, Thr, Val Val 107 Arg H97 Ala VH3 Ala, Arg, Asn Asp, None Leu, Tyr, Ile Gln, Glu, Gly, His, Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, Val 107 Arg H98 Thr VH3 Ala, Arg, Asn Asp, His, Ile, Leu, Tyr, Phe, Gln, Glu, Gly, His, Met, Phe, Tyr His Leu, Met, Phe Pro, Ser, Thr, Trp, Tyr, Val 107 Arg H99 Ser VH3 Ala, Gly, Phe, Pro None Pro, Ala, Phe 106 Cys, 107 H100 Leu VH3 Arg, His, Ile, Leu, Lys, Phe, Trp, Tyr Tyr, Trp, Arg, 108 Gly Phe, Pro, Trp, Tyr, Val Phe 106 Cys H100A Ser VH3 Ala, Arg, Asn, Asp, Arg, Asn, Gln, Arg, Leu, Gln, Glu, His, Leu, Glu His, Leu, Trp Lys, Met, Phe Pro, Lys, Met, Ser, Thr, Trp Phe, Pro, Trp 112 Arg, 138 L29 Ala VL1 Ala, Arg, Asn Asp, none Glu, Asp, Gly Gln, Glu, Gly, His, Gln Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, Val 112 Arg, 127 L31 Tyr VL1 Ala, Arg, Asn Asp, None Glu, Asp, Tyr, 129 Gly Gln, Glu, Gly, His, Trp Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, Val 130 Cys L91 Tyr VL3 Arg None Arg 131 Leu, 132 L95A Ser VL3 Ala, Arg, Asn Asp, Phe, Trp, Tyr Phe, Tyr, Gly, 134 Met Gln, Glu, Gly, His, His Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, Val 130 Cys, 131 L95B Gly VL3 Ala, Arg, Asn Asp, None Glu, Asp, Leu Gln, Glu, Gly, His, Pro Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, Val 131 Leu L95C Ser VL3 Ala, Arg, Asn Asp, Arg, Asn, Gln, Trp, Tyr, Gln, Glu, Gly, His, Glu, Ile, Leu, Phe Leu, Lys, Met, Phe Lys, Met, Phe, Pro, Ser, Thr, Trp, Tyr, Trp, Tyr, Val Val *138 Glu L93 Ser VL3 Ala, Arg, Asn Asp, None Glu, Asp, (4.07 Å) Gln, Glu, Gly, His, His Leu, Lys, Met, Phe Pro, Ser, Thr, Trp, Tyr, Val *131 Leu L96 Gly VL3 Asn none Asn (4.03 Å) Using computational prediction methods (Accelrys Discovery Studio 4.1), possible amino acid substitutions are also shown for each CDR/paratope residue that are predicted to not negatively affect the stability of TFPI-23 or the affinity to TFPI (<0.5 kcal/mol, columns 4-6). These are categorized into three groups: (1) those with at least a neutral effect on binding (<0.5 kcal/mol affinity, col. 4), (2) those that have a neutral/stabilizing effect on binding (<−0.5 kcal/mol affinity, col. 5) and (3) the top 3 predicted sites with the most stabilizing effect on affinity. Kabat numbering is used for all residues (col. 6). 138Glu/L93Ser and 131Leu/L96Gly are included as optional contact residues because the distance marginally exceeds 4 Å (4.07 Å and 4.03 Å, respectively), but is close enough to be rounded to 4 Å.

TABLE 29B TFPI epitope residues and corresponding TFPI-23 paratope residues TFPI epitope residue TFPI-23 paratope residue TFPI residues within 4.0 Å of residues on antibody TFPI-23 102 Asp H58 Tyr 104 Gly H58 Tyr 105 Ile H33 Ala, H50 Ala, H51 Ile, H52 Ser, H56 Ser, H58 Tyr, H95 Leu 106 Cys H100 Leu, H100A Ser 107 Arg H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu 108 Gly H100 Leu 112 Arg L29 Ala, L31 Tyr 127 Tyr L31 Tyr 129 Gly L31 Tyr 130 Cys L91 Tyr, L95B Gly 131 Leu H47 Trp, H50 Ala, H58 Tyr, L95A Ser, L95B Gly, L95C Ser 132 Gly H58 Tyr, L95A Ser 134 Met L95A Ser 138 Glu L29 Ala Hydrogen Bonded Residue Pairs 102 Asp H58 Tyr 107 Arg H100 Leu 107 Arg H96 Gly 107 Arg H99 Ser 107 Arg H97 Ala 107 Arg H98 Thr 112 Arg L29 Ala 127 Tyr L31 Tyr 131 Leu L95B Gly a non-zero change in buried surface area due to interaction with the cognate antigen/antibody A cutoff (BSA of 20 Å² or greater, or involved in electrostatic interaction) is applied 102 Asp H58 Tyr 105 Ile H33 Ala, H58 Tyr, H95 Leu 106 Cys H95 Leu, H100 Leu, H100A Ser, L91 Tyr 107 Arg H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu 108 Gly H100 Leu 112 Arg L29 Ala, L31 Tyr 127 Tyr L31 Tyr, L95B Gly 129 Gly H100A Ser, L31 Tyr, L91 Tyr 130 Cys H95 Leu, H100A Ser, L31 Tyr, L91 Tyr, L95B Gly 131 Leu H58 Tyr, H95 Leu, L31 Tyr, L91 Tyr, L95A Ser, L95B Gly 132 Gly H58 Tyr, L95A Ser 134 Met L95A Ser 138 Glu L29 Ala

TABLE 29C TFPI epitope residues and corresponding TFPI-23 paratope residues by BSA (no cutoff of minimal BSA applied) a non-zero change in buried surface area due to interaction with the cognate antigen/antibody TFPI epitope residue TFPI-23 paratope residue 102 Asp H56 Ser, H58 Tyr 104 Gly H58 Tyr 105 Ile H33 Ala, H34 Met, H50 Ala, H51 Ile, H52 Ser, H56 Ser, H58 Tyr, H95 Leu 106 Cys H95 Leu, H100 Leu, H100A Ser, L91 Tyr 107 Arg H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu 108 Gly H100 Leu 112 Arg L29 Ala, L31 Tyr, L93 Ser 127 Tyr L31 Tyr, L95B Gly 129 Gly H100A Ser, L31 Tyr, L91 Tyr 130 Cys H95 Leu, H100A Ser, L31 Tyr, L91 Tyr, L95B Gly 131 Leu H47 Trp, H50 Ala, H58 Tyr, H95 Leu, L31 Tyr, L91 Tyr, L95A Ser, L95B Gly, L95C Ser, L96 Gly 132 Gly H58 Tyr, L95A Ser 133 Asn L95A Ser 134 Met L93 Ser, L94 Ser, L95A Ser 138 Glu L28 Gly, L29 Ala, L93 Ser

Example 11 Dilute Prothrombin Time (dPT)

The ability of the anti-TFPI antibodies to inhibit endogenous TFPI in human FVIII deficient plasma (Hemophilia A) was studied using a dilute prothrombin time (PT) assay. The dilute PT is a modified PT assay using diluted Tissue Factor (Innovin) to prolong the clotting time.

For the dPT analysis in humanFVIII deficient plasma (George King Biomedical), the Innovin® reagent was diluted 1:3000 in a dilution buffer (Imidazole 50 mM, sodium chloride 0.1 M, BSA 1 mg/mL, calcium chloride 8.34 mM, pH 7.4) and preincubated to 37° C. Plasma was thawed in a 37° C. water bath for 5 minutes immediately before assay. Dilutions of anti-TFPI antibodies were prepared in PBS and added to plasma and the plasma was incubated for 20 minutes at room temperature. Following this incubation, 50 μL of the plasma was incubated for 1 minute at 37° C. and the clotting reaction was initiated immediately with the addition of 50 μL of 1:3000 dilution of Innovin® reagent warmed to 37° C. The time to clot was performed at 37° C. using a STart®4 Coagulation Analyzer. Data points were collected in duplicate, entered into Microsoft excel and the Effective concentration (EC50) at 50% was estimated using GraphPad Prism®. The results are shown in Table 30.

TFPI down regulates the extrinsic FVIIa/TF/FXa pathway of coagulation, decreasing the generation of FXa and ultimately thrombin. The dPT measures the effects on the extrinsic pathway of coagulation. The data show that the addition of the anti-TFPI antibodies to hemophilia A plasma dose-dependently shortened the clotting time. Control IgG at 300 nM had no effect on the clotting time.

TABLE 30 Anti- Anti- Anti- Anti- Anti-TFPI- Anti-TFPI- TFPI- TFPI- TFPI- TFPI- 23 106 24 118 4F36 h4D8 EC50 (nM) 0.98 1.24 0.57 1.16 0.44 0.47

Example 12 Thromboelastography (TEG)

Thromboelastography (TEG) is a global hemostatic assay that measures the kinetics of clot formation in whole blood. Whole blood was isolated from healthy human donors drawn into plastic blood collection tubes containing 3.2% sodium citrate, and to minimize introduction of coagulation activators, such as tissue factor, the first drawn tube of blood was discarded. The citrated whole blood was treated for one hour with a control mouse-anti human IgG2 (100 mcg/mL) or with an inhibitory FVIII antibody (GM1805 (Green Mountain), 100 mcg/mL) to inhibit endogenous FVIII, inducing a hemophilia A-like phenotype. The whole blood (320 μL) dosed with anti-TFPI antibodies or IgG1 control antibody was added to a TEG® reaction cup containing 20 μL of 0.2 M calcium chloride and 20 μL of lipidated tissue factor (Innovin®) diluted in 20 mM HEPES, 150 mM sodium chloride, pH 7.4 resulting in a final lipidated tissue factor dilution of 1:200,000 in each reaction. Reactions were run in duplicate and immediately commenced upon addition of whole blood to the TEG cup. Analysis was performed on TEG® 5000 Hemostasis analyzers using TEG® software according to the manufacturer's instructions following calibration with Level I and Level II controls (Haemonetics). The reactions were performed at 37° C. for 60 minutes. See Table 31.

TABLE 31 TEG Parameters in Antibody Induced Hemophilia A (HA) Blood Treated with Anti-TFPI Antibodies TEG Parameters R-Value K Value Alpha angle MA Group min min degrees mm Hemophilia A Blood 41.45 ± 2.33   6 ± 0.7 33.75 ± 1.6  59.8 ± 4.67 Anti-TFPI-4F36 (100 nM)   23 ± 0.14 4.65 ± 0.21 41.4 ± 1.8  60.4 ± 0.14 Anti-TFPI-4F36 (300 nM) 24.05 ± 0.07  7.0 ± 0.42 28.35 ± 2.9  56.45 ± 0.49  Anti-TFPI-2A8-200 (100 nM) 26.85 ± 0.92  8.3 ± 0.14 24.5 ± 0.14 50.75 ± 0.49  Anti-TFPI-2A8-200 (300 nM)  20.4 ± 0.84 6.25 ± 0.77 31.7 ± 5.09 54.05 ± 1.9  Anti-TFPI-106 (100 nM) 25.25 ± 0.92 5.35 ± 0.07 38.3 ± 1.2  67.6 ± 0.98 Anti-TFPI-106 (300 nM) 17.85 ± 0.07 4.65 ± 0.21 40.85 ± 1.2  59.15 ± 1.34  Normal Blood   10 ± 0.28 2.2 60.2 ± 0.56 62.8 ± 1.98

Table 31 shows that treatment of the whole blood with the FVIII antibody significantly prolonged the TEG-R value to 41.5 minutes. In the presence of whole blood anti-TFPI 106 showed a favorable profile relative to 2A8-200 and 4F36. The addition of TFPI-106, 2A8-200, or 4F36 (300 nM) resulted in a shortening of TEG-R value to 17.85 minutes, 20.4 minutes and 24.05 minutes, respectively. Anti-TFPI 106 promoted clotting in hemophilia blood as exhibited by the decrease in the TEG-R-Value and the increase observed in the TEG-alpha angle.

Example 13 Neutralization of TFPI and Thrombin Generation

The neutralization of TFPI by TFPI antibodies was measured using two chromogenic assays, a direct Factor Xa activity assay and a two-stage FVIIa/TF/FXa assay based on TFPI inhibition of FXa generation by TF-FVIIa. In the first assay, TFPI-106, TFPI-118, hz4D8, and two reference antibodies, 4F36 or 2A8-200, were preincubated at various concentrations (0-500 nM) with a fixed concentration of human recombinant TFPI K1K2 and FXa to allow the complex to form. FXa activity was evaluated using a chromogenic FXa substrate. The addition of TFPI antibodies of the invention caused a dose-dependent increase in FXa activity in this assay (see Table 32, Xa Inhibition Assay, EC₅₀ values).

In vivo, the two predominant forms of TFPI are TFPI-alpha (K1K2K3) and TFPI-beta (K1K2). The ability of TFPI antibodies to inhibit recombinant TFPI K1K2 or TFPI K1K2K3 was assessed in the two-stage FVIIa/TF/FXa assay. This assay measures the combined effects of neutralization of the TFPI inhibition of both FXa and FVIIa/TF/FXa. Antibodies were incubated at increasing concentrations (0-500 nM) with TFPI, added to the assay with FVIIa/TF/FX and FXa activity was measured using an FXa chromogenic substrate. TFPI antibodies of the invention neutralized the TFPI K1K2 inhibition of the FVIIa/TF mediated FX activation (See, Table 32, FVIIa/TF/Xa EC₅₀ values). Exemplary antibodies of the invention were also effective at inhibiting TFPI K1K2K3 (EC₅₀ for TFPI-106 is 8.47 nM for neutralization of FVIIa/TF/FXa Inhibition by TFPI K1K2K3). The data demonstrates inhibition of full length and truncated TFPI.

Clinical severity of hemophilia is related to the residual level of clotting factor activity. Factor activity of <1% is associated with a severe phenotype, moderate hemophilia is associated with a factor activity or 2-5% and mild with a factor activity of >5%-<40%). The defects in the intrinsic coagulation pathway in hemophilia result in the inadequate generation of thrombin. The thrombin generation assay (TGA) was utilized to examine inhibition of endogenous TFPI in platelet poor hemophilic plasma. The TGA assay measures the initiation phase, activation phase and inactivation phase of thrombin generation. The abilities of TFPI antibodies to restore thrombin generation in platelet poor hemophilia plasma were tested using a Calibrated Automated Thrombin (CAT) generation assay. TFPI-106, TFPI-118, hz4D8, and two reference antibodies, 4F36 or 2A8-200 (0-500 nM) were incubated in hemophilia plasma to neutralize TFPI prior to the addition to the assay. Compared to normal human pooled plasma, thrombin generation is markedly reduced in human hemophilic plasma. A dose-dependent response was observed when a normal control, FACT, which is standardized at 1 U/mL FVIII was spiked into the hemophilia A plasma. Similarly, the addition of B-domain deleted FVIII at 200 ng/mL (1 U/ml) restored thrombin generation to 100 nM. Over the 60 minute time course of the assay, minimal thrombin generation was observed in hemophilic plasma. Incubation of the plasma with antibodies of the invention resulted in dose-dependent increase in peak thrombin, endogenous thrombin potential and velocity index. References antibodies 2A8-200 and 4F36 were also assayed for comparison (Table 32, TGA Velocity EC₅₀ values).

Example 14 In Vivo Efficacy in Hemophilia Mouse Models

Efficacy of certain anti-TFPI antibodies as procoagulants was tested using the acute tail transection assay in hemophilic mice. In the assay, the distal portion of the tail was amputated resulting in substantial blood loss, which can be reduced if a hemostatic agent is administered before or shortly after the transection is made. Hemophilic mice received a single intravenous (IV) dose in a volume of 4 ml/kg via the tail vein of anti-TFPI antibodies (6 mg/kg), a non-specific IgG control (6 mg/kg), or saline vehicle. At different times after dosing, the effect of the antibodies on bleeding was assessed as follows.

Mice were anesthetized with Ketamine/Xylazine cocktail intraperitoneally. The tails were immersed in 50 mL of prewarmed phosphate buffered saline (PBS) at 37° C. for 2 minutes. A 3 mm tail transection was made and blood was collected into PBS for a 10 minute period. Volume of blood loss was then quantified by measuring the hemoglobin content of the PBS using the following technique. Tubes were centrifuged to collect erythrocytes, resuspended in 5 mL of lysis buffer (8.3 g/l ammonium chloride, 1.0 g/l potassium bicarbonate, and 0.037 g/l EDTA), and the absorbance at 575 nM of the samples measured by spectrophotometer. Absorbance values were converted to total blood loss (4) using a standard curve. The statistical significance of the difference between means was assessed by the analysis of variance (ANOVA) followed by Dunnett's multiple comparison test using GraphPad Prism software. Results are expressed as mean±standard error of the mean (SEM). In the figures described below, statistical significance is defined as a P value <0.05, and is indicated by an asterisk above the data.

FIG. 3A shows the effect on blood loss in hemophilia A mice (denoted FVIII−/−) after tail transection of dosing at different times before tail transection with the 2A8-200 antibody compared to vehicle control (saline). FIG. 3B shows the effect on blood loss in hemophilia A mice (denoted FVIII−/−) after tail transection of dosing at different times before tail transection with the 2A8 antibody compared to vehicle control (saline) and a non-specific human IgG1 (denoted hIgG₁). FIG. 3B also shows the effect on blood loss in normal mice (denoted FVIII+/+) after tail transection of dosing the 2A8 antibody at two different times before tail transection. FIG. 3C shows the effect on blood loss in hemophilia A mice after tail transection of dosing at different times before tail transection with the antibodies 4D8, 21, 23, and 24, compared to vehicle control (saline). FIG. 3D shows the effect on blood loss in hemophilia A mice after tail transection of dosing at different times before tail transection with antibody 106, compared to vehicle control (saline). FIG. 3E shows the effect on blood loss in hemophilia A mice after tail transection of dosing at different times before tail transection with antibody 118, compared to vehicle control (saline). FIG. 4 shows the effect on blood loss in hemophilia B mice after tail transection of dosing at different times before tail transection with antibody 106, compared to vehicle control (saline).

As shown in FIG. 3D and FIG. 4, administration of 6 mg/kg anti-TFPI antibody 106 to hemophilia A or hemophilia B mice decreased blood loss in an acute traumatic injury model when the antibodies were administered at different times before the tail transection injury. In hemophilia A mice, the hemostatic effect persisted at least as long as 189 hours after administration, although by 240 hours after administration the effect returned to control levels. In hemophilia B mice, the effect persisted at least as long as 72 hours after administration, and had returned to baseline by 192 hours after administration.

The data and results described above suggests that the antibodies tested, including antibody TFPI 106, can be administered prophylactically to subjects with hemophilia A or hemophilia B to reduce bleeding before a traumatic injury or other type of bleeding episode.

The effect of antibody TFPI 106 as a hemostatic in hemophilia A mice was also tested to determine if it could reduce bleeding when administered shortly after tail transection. These experiments were carried out using similar methodology as those testing the effect of antibodies when administered prior to tail transection, except that immediately after tail transection an IV dose of TFPI 106 (6 mg/kg) or recombinant Factor VIII (200 units/kg) was infused via a cannulus inserted into the jugular vein, after which blood was collected for 10 minutes before quantifying blood loss. In a second series of experiments different doses of TFPI 106 and Factor VIII (200 U/kg) were administered separately to hemophilia A mice 2 minutes after tail clip, and then blood collected for 10 minutes before quantifying blood loss.

FIG. 9A shows that 6 mg/ml of antibody TFPI 106 administered immediately after tail transection was effective to reduce blood loss in hemophilia A mice compared to vehicle control, although not to the same extent as 200 U/kg Factor VIII administered in the same way. FIG. 9B shows that antibody TFPI 106 dose-responsively reduces bleeding in hemophilia A mice when administered 2 minutes after injury by tail transection, and that at the highest dose tested (6 mg/kg), TFPI 106 was about as effective as recombinant Factor VIII at 200 U/kg when both were administered 2 min after tail transection. The data and results described in these figures suggests that antibody TFPI 106 can be effective as an on-demand treatment for bleeding that has already begun in subjects due to trauma, or some other cause.

Example 15 Pharmacokinetics and Product Metabolism

The pharmacokinetics (PK) and/or toxicokinetics (TK) of TFPI-106 were characterized after intravenous (IV) and/or subcutaneous (SC) dosing in Wistar Han rats, New Zealand White rabbits and cynomolgus monkeys.

Anti-TFPI in sodium citrated rabbit plasma was quantified using a sandwich immunoassay on the Gyrolab. Response Units were read by the Gyrolab instrument at 1% Photomultiplier tube (PMT) setting. Sample concentrations were determined by interpolation from a standard curve that was fit using a 5-parameter logistic curve fit with 1/y2 response weighting. The standard points in assay buffer contained 5% pooled sodium citrated rabbit plasma ranging from 0.78 ng/mL to 891 ng/mL, and the range of quantitation in 100% rabbit plasma matrix was 90 ng/mL to 5500 ng/mL. Five samples of Anti-TFPI at 0.45, 8.0, 47.15, 153, and 275 ng/ml in assay buffer containing 5% pooled sodium citrated rabbit plasma served as quality control.

Anti-TFPI in sodium citrated rat plasma was also quantified using a sandwich immunoassay on the Gyrolab as described above. The standard points in assay buffer containing 5% pooled sodium citrated rat plasma ranged from 0.78 ng/mL to 891 ng/mL, and the range of quantitation in 100% rat plasma matrix was 90 ng/mL to 5500 ng/mL. Five samples of anti-TFPI at 0.45, 8.1, 47.15, 153, and 275 ng/ml in assay buffer containing 5% pooled sodium citrated rat plasma served as quality control.

A total human Ig quantitative ligand-binding assay using the Meso-Scale Discovery (MSD) assay platform was used to quantify anti-TFPI antibody in cynomolgus monkey plasma. Bound anti-TFPI antibody was detected with a ruthenylated mouse anti-human IgG Fc antibody to produce an electrochemiluminescent signal within the MSD instrument. Sample concentrations were determined by interpolation from a standard curve that is fit using a 5-parameter logistic equation, weighting formula for standard curve is 1/ŷ2. The standard points in 5% monkey plasma ranged from 0.999 ng/mL to 1156 ng/mL anti-TFPI antibody, and the range of quantitation in 100% plasma was 64.8 ng/mL to 7136 ng/mL. Five samples of anti-TFPI antibody at 64.8, 117, 680, 3964 and 7136 ng/mL in 100% plasma diluted to the MRD of 1:20 (3.24, 5.83, 34.0, 198 and 357 ng/mL in 5% plasma, respectively) serve as quality control.

In New Zealand White rabbits, TFPI-106 exhibited a faster clearance (CL) compared to an isotype control monoclonal antibody (mAb). In cynomolgus monkeys, TFPI-106 exhibited nonlinear PK kinetics at low doses consistent with target-mediated drug disposition (TMDD) observed for anti-TFPI antibodies. See Table 32.

Table 32 summarizes certain pharmacokinetic properties and pharmacological activities of exemplary anti-TFPI antibodies of the invention (hum4D8, TFPI-106, and TFPI-108), as well as two reference antibodies (4F36 and 2A8-200).

TABLE 32 Pharmacokinetic properties and pharmacological activities of exemplary anti-TFPI antibodies hz4D8 TFPI-106 TFPI-118 4F36 2A8-200 Source hybridoma lambda library lambda library Reference Reference Ab Ab Germline frameworks DP-54 & DP-47/VH3 & DP-31/VH3 & NA NA DPK9 DPL8/VL1 DPL3A/L1 Human IgG subclass IgG1-3M IgG4 Kd (nM) Human TFPI 0.42 3.7 9.61 0.493 0.327 K1K2 Kd (nM) Cyno TFPI 0.067 1.22 1.8 0.425 0.637 K1K2 Kd (nM) Rabbit TFPI 0.502 4.25 5.79 1.81 0.145 K1K2 Kd (nM) Mouse TFPI No binding 0.575 45.6 No binding 0.455 K1K2 Kd (nM) Rat TFPI No binding 1.57 3.65 No binding NA K1K2 Epitope K2 K2 K2 K2 K1K2 Biacore competition Yes No Yes NA Yes with 4F36 Polyreactivity screen negative negative negative ND Yes Xa Inhibition Assay 6.92 18.08 20.8 6.57 2.42 EC50 nM FVIIa/TF/Xa EC₅₀ nM 0.4 4.3 4.03 1.85 4.84 TGA Velocity EC₅₀ nM 3.9 3.07 7.72 1.7 Dilute PT EC₅₀ nM 0.47 1.24 1.16 0.44 1 Mouse HA tail Clip NA 2.4 1.1 NA NT IC₅₀ HA Mouse tail clip −0.5 h NA 55% 55% NA 32%   96 h 39% 39% 32%  196 h ~6%  19% Rabbit IHM 60% 60% 60% 60% 27% Efficacy at 0.5 hr Duration by aPTT/dil ≧48 hours ≧48 hours ≧48 hours ≧48 hours ≧48 hours PT Rabbit half life t½ at 14 hours 29 hours 15 hours 11 hours 12 hours 2 mg/kg

Example 16 Hemostatic Effect of Antibody Inhibition of TFPI Enhances Platelet Accumulation and Fibrin Generation In Vivo in a Laser Induced Injury Model in Hemophilic Mice

As previously stated elsewhere herein, Tissue Factor Pathway Inhibitor (TFPI) is a plasma serine protease inhibitor that directly binds and inhibits the Tissue Factor (TF)/Factor VIIa/Factor Xa complex and modulates the initiation of coagulation induced by TF. Blocking TFPI can potentially facilitate hemostasis initiated by TF/FVIIa compensating for loss of factor VIII (FVIII) or factor IX in hemophilia A or B. The antibodies of the invention inhibit TFPI with broad species cross reactivity. Herein, the hemostatic effect of TFPI-106 on platelet clot formation and fibrin deposition in vivo was assessed using intravital microscopy (IVM) in hemophilia A and B mice.

Materials and Methods:

TFPI-106 antibody, recombinant Factor VIII and vehicle (phosphate buffered saline) were prepared as previously described elsewhere herein. Dylight-649 anti-CD42c antibody was obtained from Emfret Analytics (Germany). Fibrin antibody clone 59D8 (Hui K Y et al. (1983) Science 222(4628):1129-1132) was labeled with Alexa Fluor 488 using a protein labeling kit according to manufacturer's instructions (Life Technologies, Carlsbad, Calif.). Male hemophilia A mice (F8 KO) weighing 30 to 35 grams on average were obtained from a proprietary line maintained at Charles River laboratories (Wilmington, Mass.). Mice were acclimated for at least 3 days prior to experimental procedures.

Male hemophilia A, hemophilia B, or C57BL/6J wild type (WT) mice were dosed with a single intravenous dose of TFPI-106 (6 mg/kg), vehicle, recombinant human FVIII (rFVIII, 200 IU/kg) or Alexa-488 labeled TFPI-106 (0.7 mg/kg). Cremaster microcirculation in anesthetized mice was observed using IVM. Platelet accumulation and fibrin generation were quantified following a laser heat injury to the vessel wall of the cremaster artery. Platelets were visualized using Dylight-649 anti-CD42c (GP1bβ) and fibrin was detected by Alexa-488 anti-fibrin clone 59D8.

More specifically, to prepare hemophilia A mice for intravital microscopy imaging, animals were anesthetized with Ketamine/Xylazine cocktail delivered intraperitoneally. The jugular vein was cannulated and sodium pentobarbital (5 mg/kg, intravenous) was used as maintenance anesthesia. The trachea was cannulated to maintain a patent airway. The cremaster muscle was then exposed to visualize the microvasculature. The animals were maintained on a warm heating pad with a warm buffered solution bathing the exposed cremaster tissue throughout the imaging period. Labeled antibodies to platelet Dylight 649 CD42c (GP1bβ) and a fibrin antibody that does not cross react with fibrinogen (Alexa Fluor 488 anti-fibrin clone 59D8), were infused via the jugular cannulus. A focused beam of laser (532 nanometers) initiated the injury on the mouse cremaster microvasculature. Each mouse received 2 laser induced injuries. The first injury was made in untreated mouse to serve as control. The second injury was made in the same mouse and TFPI-106 (at 6 mg/kg) was immediately administered intravenously via the jugular cannulus. In both injuries, clot formation was monitored from fluorescent intensities of platelet accumulation and fibrin deposition.

Data points (fluorescence intensities) were collected and analyzed using SlideBook software (Version 6.0). Median fluorescence intensities were plotted as a function of time for each individual clot and the corresponding area under the curve was measured using GraphPad® Prism software (Version number 6.03). Statistical significance was determined using a Mann-Whitney test using GraphPad® Prism software (Version number 6.03).

Results:

TFPI was detected at the site of platelet accumulation within the platelet clot and the lining the endothelium using Alexa-488 labeled TFPI-106 in VVT mice (FIG. 5). FIG. 5A comprises six top panels (numbered 1 through 6) showing the detection of platelets using Dylight 649 CD42c in a WT mouse administered control IgG labeled using Alexa 488 at 0 (panel 5A-1), 15 (FIG. 5A-2), 30 (FIG. 5A-3), 60 (FIG. 5A-4), 90 (FIG. 5A-5) and 120 (FIG. 5A-6) seconds post-laser induced injury. No Alexa 488 label was detected in the platelet thrombus (detected using Dylight 649 CD42c) at the site of injury. FIG. 5B, comprising six panels (numbered 1-6) along the bottom of the Figure, shows that Alexa 488 labeled TFPI-106 was detected commencing at about 15 seconds (FIG. 5B-2) and increasing in fluorescent intensity at about 30 (FIG. 5B-3), 60 (FIG. 5B-4) and 90 (FIG. 5B-5) seconds and then sustained intensity at about 120 seconds (FIG. 5B-6) in the platelet thrombus along the endothelium after laser induced injury in the VVT mouse, where the platelets were detected using Dylight 649 labeled CD42c.

TFPI-106 enhanced platelet accumulation and fibrin generation in hemophilia A (F8 KO) mice compared with hemophilia A mice treated with vehicle at about 0.5 hours and the effect persisted at about 168 hours. More specifically, in TFPI-106 treated F8 KO mice (hemophilia A), IVM showed increased green fluorescence (Alexa 488 anti-fibrin clone 59D8) and red fluorescence (Dylight 649 labeled CD42c anti-GP1bβ detecting platelets) at the injury site at about 0.5 hours which persisted at about 168 hours, and the fluorescence pattern was similar to that observed in WT mice treated with vehicle. However, such fluorescence was not detected in vehicle treated hemophilia A mice where neither platelet accumulation nor fibrin generation were observed.

Hemophilia A mice exhibited an increase in platelet accumulation (FIG. 6A) and fibrin deposition (FIG. 6B) at about 0.5 hours post dosing with TFPI-106, similar to levels achieved by rFVIII (*=P<0.005 is indicated on each graph). The hemostatic effect was persistent for up to 168 hours with TFPI-106 in Hemophilia A mice. Similarly, TFPI-106 treated Hemophilia B mice similarly demonstrated improved hemostasis at about 30 minutes post dosing with an increase in platelet accumulation and fibrin generation compared to vehicle controls. Neither TFPI-106 nor rFVIII dosed hemophilic mice reached the maximal level of fibrin deposition observed in non-hemophilic WT mice. Thus, the data show that following a laser injury to the endothelium, TFPI was detected at the site of injury. More importantly, the data demonstrate that administration of TFPI-106 to hemophilic mice results in a significant and persistent improvement in hemostasis in a laser injury model.

Example 17 Thrombin Generation Effect of Anti-TFPI Inhibition in Combination with FVIIa in Hemophilia A and B TGA

Methods: Thrombin Generation Assays (TGA)

The effect of anti-TFPI antibody TFPI-106 on thrombin generation was evaluated alone and in combination with recombinant FVIIa (rFVIIa) in hemophilic plasmas using the thrombin generation assay (TGA). Citrated platelet poor severe hemophilia A (FVIII deficient), severe hemophilia A with an inhibitor, or hemophilia B (FIX deficient) plasma were from donors with a congenital deficiency obtained from George King Biomedical (Overland Park, Kans.) and HRF (Raleigh, N.C.). Normal pooled plasma (non-hemophilic) was obtained from George King Biomedical. Thrombin generation reagents; PPP-Reagent LOW (4 μl phospholipid and 1 pM tissue factor final in the reaction); FluCa buffer (containing calcium chloride and fluorogenic substrate) and thrombin calibrator were obtained from Diagnostica Stago (Parsippany, N.J.). Thrombin generation assays were performed using the Calibrated Automated Thrombogram (CAT) including the Fluoroskan Ascent fluorescent plate reader (Thrombinoscope BV, Maastricht, Netherlands).

Recombinant FVIIa (rFVIIa in 20 mM HEPES, 150 mM sodium chloride, 1% Bovine Serum Albumin (BSA), pH 7.4) was added to 70 μl hemophilia A plasma at concentrations up to 20 μg/mL. Twenty μl of PPP-Reagent LOW and 10 μl of anti-TFPI 106 were added to reaction wells at a final concentration of 16 μg/mL. Reference calibrated control reactions included 20 μl thrombin calibrator with 70 μl plasma. Vehicle (Phosphate buffered saline (PBS)) was used to test the 0 μg/mL concentration. Ten μl of vehicle was added to reference calibrator wells. In a second set of reactions rFVIIa (5 μl) in HEPES buffer or HEPES buffer (5 μl) were added to 70 μl of hemophilic plasma samples (hemophilia A, hemophilia A with an inhibitor or hemophilia B) for a final concentration of rFVIIa in the plasma of 2 μg/mL. Twenty μl of PPP Reagent LOW and 5 μL of anti-TFPI 106 (diluted in PBS) or PBS (5 μl) were added to the rFVIIa-dosed hemophilic plasma samples (75 μl) and to the HEPES buffer-treated hemophilic plasma (75 μl), to final concentrations of 16 μg/mL. In addition, anti-TFPI 106 (at 16 μg/mL) was assayed in HEPES buffer treated non-hemophilic plasma (75 μl). Control untreated non hemophilic plasma (80 μl) was included in the analysis. Reference calibrated reactions (20 μl thrombin calibrator with 80 μl of vehicle dosed hemophilic or non-hemophilic plasma or 80 μl of untreated non-hemophilic plasma) were run in parallel. All reactions were run in duplicate. Samples were incubated at 37° C. for 5 minutes and the reactions were then initiated by addition of 20 μl of FluCa a total reaction volume of 120 μl. Fluorescence of plasma reactions was read at 37° C. at 20 second intervals on a Fluoroskan Ascent fluorometer and compared to the reference thrombin calibrator reactions to determine thrombin concentrations. The intensity of the fluorescence signal was continuously monitored at 37° C. using the CAT.

Results:

The deficiencies in coagulation factors FVIII (hemophilia A) and FIX (hemophilia B) prevent sufficient thrombin generation for the conversion of fibrinogen to fibrin for the development of a stable clot. Anti-TFPI-106, a novel monoclonal antibody that specifically binds to and inhibits and/or neutralizes the inhibitory activity of TFPI, targets the extrinsic tissue factor/FVIIa pathway of coagulation. Patients with inhibitors receiving TFPI-106 may also receive rFVIIa to treat a breakthrough bleed. Thus, the effect of TFPI-106 on thrombin generation, in the presence and absence of rFVIIa, in hemophilia plasma, was examined in vitro using the art-recognized TGA (thrombin generation assay).

In vitro studies using the thrombin generation assay in citrated platelet poor factor VIII deficient human plasma were performed to study the activity of TFPI-106 in the presence of rFVIIa. In one study, anti-TFPI 106 was added to factor VIII deficient human plasma at a fixed concentration (16 μg/mL), a concentration of rFVIIa that is known to increase thrombin generation in hemophilia A plasma. rFVIIa was added to the assay at increasing concentrations up to 20 μg/mL. Surprisingly, the combination of TFPI-106 and rFVIIa restored thrombin generation to levels observed in normal plasma. The peak thrombin levels observed with the combination of TFPI-106 and a range of rFVIIa (eptacog alfa) from 0.2, 2, and 20 μg/mL were similar. The data, as shown in FIG. 7, demonstrate that TFPI-106 improved the thrombin generation response of severe hemophilia A plasma dosed with rFVIIa (FIG. 7, solid black, dark gray and light gray lines).

The effect of TFPI-106 (16 μg/mL; FIG. 7, dark gray dashed line) on thrombin generation was also measured in non-hemophilia plasma, which would have the full complement of coagulation factors. Consistent with the TFPI extrinsic pathway inhibitory activity of TFPI-106, the addition of anti-TFPI 106 resulted in an increase in thrombin generation with a decrease in the lag time and increase in peak thrombin. The peak thrombin ˜200 nM with the addition of TFPI-106 and rFVIIa is within the range reported for normal non-hemophilic plasmas.

The TFPI inhibitory activity of TFPI-106 on thrombin generation in the presence and absence of rFVIIa was further studied in additional hemophilia A plasmas (FIG. 8A; 1 pM tissue factor and 4 μM phospholipids), hemophilia B plasma (FIG. 8C; 3 BU inhibitor) and in hemophilia A plasma (FIG. 8B; 3 BU inhibitor) with an inhibitor and the results are graphically shown in FIGS. 8A, 8C and 8B, respectively. TFPI-106 was added to the plasmas for a final concentration of 16 μg/mL. The final concentration of rFVIIa in these studies was 2 μg/mL. The addition of 2 μg/mL rFVIIa to a hemophilic plasma resulted in a modest increase in thrombin generation compared to vehicle control. The addition of 16 μg/mL TFPI-106 alone or in combination with rFVIIa resulted in an increase in thrombin generation including higher peak thrombin concentration and shortening of lag time compared to addition of rFVIIa alone. A minimal additive effect in thrombin generation was observed after co-treatment of rFVIIa and TFPI-106. The peak thrombin levels achieved at 16 μg/mL TFPI-106 alone or in combination with rFVIIa were comparable to those observed in non-hemophilic plasma and did not exceed the level observed in non-hemophilic plasma dosed with TFPI-106. These data demonstrate that TFPI-106 was effective in bypassing the deficiencies of thrombin generation in hemophilia A, hemophilia B and in hemophilia A plasma with inhibitors.

Example 18 Procoagulant Activity in Human Hemophilic Blood and Plasma

This example describes the hemostatic activity of antibody TFPI-106 when tested using whole blood and plasma obtained from human subjects having hemophilia A and B in comparison to recombinant coagulation factors Factor VIII and Factor IX.

Materials and methods. Whole blood and plasma (platelet rich and platelet poor) were obtained from volunteer hemophilia patients at least 18 years of age under an institutional review board approved protocol. The subjects had moderate or severe Factor VIII (FVIII) or Factor IX (FIX) deficiency, with or without inhibitory antibodies, but were otherwise healthy and in a non-bleeding state. Volunteers were excluded if they had used any factor replacement therapy within the previous 48 hours before study entry, had active bleeding or had a medical or family history of thrombosis. Of the 11 volunteers, 5 had severe FVIII deficiency, 2 had moderate FVIII deficiency, 1 had moderate FIX deficiency and 3 had severe FVIII deficiency with a FVIII inhibitor. To complete all aims of the study, 46 mL of blood (10 blood tubes) were collected from each volunteer via aseptic venipuncture into evacuated tubes containing 3.2% sodium citrate.

Test articles included TFPI 106, a negative control isotype matched anti-human IgG₁, recombinant human Factor VIII, and recombinant human Factor IX, which were added to whole blood or plasma, depending on the experiment. Depending on the assay, TFPI 106 was tested at 1, 5, 20, 50 or 100 nM, control IgG₁ antibody at 100 nM, and recombinant FVIII or FIX at levels that would achieve 5%, 10% or 40% of normal factor activity based on an activated partial thromboplastin time (aPTT) assay. To achieve desired concentrations, test articles were diluted with a dilution buffer at pH 7.4, comprising 20 mM HEPES, 150 mM NaCl, and 0.5% Bovine Serum Albumin.

Three types of assays were used to determine the procoagulant effect of the test articles, including rotational thromboelastography (ROTEM), thrombin generation assay (TGA), and dilute prothrombin time (dPT) assay.

ROTEM measures the viscoelastic properties of the whole blood sample as it clots under low shear conditions. As clotting proceeds, the viscosity of the sample increases, which can be analyzed graphically. ROTEM was performed using a ROTEM analyzer (Pentapharm GmbH, Munich, Germany) using Pentapharm software 1.0.04 to assess coagulation in whole blood. Clotting was initiated by adding 0.020 mL of a 1:2333 dilution of lipidated tissue factor (Innovin, Siemens Healthcare) for a final reaction dilution of 1:42000, and 0.020 mL of CaCl₂ to 0.300 ml of citrated whole blood. All reactions were run in duplicate. ROTEM parameters were monitored and ROTEM clotting time (CT) analyzed. Data collected by the device software was exported to Microsoft Excel 2010 and/or GraphPad Prism (version 6) for analysis. For each volunteer, the percent change in ROTEM clotting time of treated samples was calculated with respect to an untreated sample from the same volunteer.

Using the thrombin generation assay (TGA), the kinetics of thrombin generation were assessed in platelet rich plasma (PRP) and platelet poor plasma (PPP) prepared from volunteer blood according to the methods of Hemker, et al., Calibrated automated thrombin generation measurement in clotting plasma. Pathophysiolol Haemost Thromb, 33:4-15 (2003). Briefly, samples of whole blood dosed with test articles were centrifuged at 150×g for 10 minutes at room temperature to obtain PRP, or 2500×g for 15 minutes at room temperature to obtain PPP. Unused plasma was frozen and stored at −80° C. In the PRP plasma, the platelet count was adjusted to 150,000 platelets per microliter with autologous PPP. Thrombin generation was immediately measured in fresh PRP. For PRP samples, 20 uL of 1 pM tissue factor (PRP Reagent, Diagnostica Stago, Inc., Parsippany, N.J.) and 80 uL of PRP were added in triplicate to wells of a 96 well microtiter plate. Thrombin generation was initiated by adding 20 ul of FLUCa buffer (16.7 mmol/l final concentration of CaCl₂ and 417 mmol/L Z-Gly-Gly-Arg-AMC fluorogenic thrombin substrate). Fluorescence intensity was detected using a Fluoroskan Ascent Fluorometer. For PPP samples, PPP-reagent-LOW (final concentration of 1 pM tissue factor and 4 micromolar procoagulant phospholipids) was used in place of PRP-Reagent and run as described for PRP samples. Thrombin generation was calculated using Thrombinoscope software version 5.0.0.742 (Thrombinoscope BV, Maastricht, The Netherlands). Data obtained from Thrombinoscope software was exported to Microsoft Excel 2010 and/or GraphPad Prism (version 6) for analysis. For each volunteer, the percent change in TGA peak thrombin concentration of treated samples was calculated with respect to the untreated sample from the same volunteer.

Dilute prothrombin time (dPT) assays were performed on a STart 4 coagulation analyzer (Diagnostica Stago, Parsipanny, N.J.). Frozen PPP was thawed and dosed with anti-TFPI 106 at concentrations of 1, 5, 20 and 100 nM or isotype control antibody at a concentration of 100 nM. Dosed plasmas were incubated at 37° C. for 30 minutes prior to dPT assay analysis. Fifty microliters of plasma was added to a STart 4 cuvette and incubated for 60 seconds at 37° C. The reaction was activated with addition of 1:6000 dilution of tissue factor reagent (Innovin) prepared in dilution buffer (50 mM Imidazole, 0.1 M sodium chloride, 1 mg/ml bovine serum albumin, and 8.34 mM CaCl₂, pH 7.4) and pre-incubated at 37° C. The time to clot was measured at 37° C. with reactions run in duplicate. Clotting times were exported to Microsoft Excel 2010 or GraphPad Prism (version 6) for analysis. The percentage change in dPT clotting for test article treated samples was calculated in reference to the dPT clotting time of the untreated sample for each volunteer.

As described in the figures, antibody TFPI-106 caused a dose-dependent increase in clotting of whole blood obtained from volunteers with hemophilia A or B, as measured using the ROTEM method. Specifically, the antibody reduced clotting time and increased maximum clot firmness compared to negative controls. In addition, TFPI-0106 resulted in dose-dependent increases in thrombin generation when added to both platelet rich and platelet poor plasma obtained from hemophilic patients, as evidenced by reductions in lag time and increased peak thrombin concentration generated, compared to negative controls.

FIGS. 10A and 10B illustrate the procoagulant effect of TFPI-106 in whole blood and plasma obtained from volunteers with severe hemophilia A. FIG. 10A shows the effect on blood clotting in the ROTEM assay of two concentrations of TFPI 106 compared to negative control IgG and concentrations of recombinant FVIII sufficient to achieve 5%, 10% and 40% of normal activity. FIG. 10B shows peak thrombin generation in platelet rich plasma of three concentrations of TFPI-106 compared to negative controls and FVIII. The assays show a dose dependent effect of reduced clotting time and increased peak thrombin generation due to TFPI 106.

FIGS. 11A, 11B, and 11C illustrate the procoagulant effect of TFPI-106 in whole blood and plasma from a volunteer with severe hemophilia A and inhibitory antibodies (inhibitors) to FVIII. FIG. 11A shows the effect on blood clotting in the ROTEM assay of two concentrations of TFPI 106 compared to negative control IgG. FIG. 11B shows peak thrombin generation in platelet rich plasma of three concentrations of TFPI-106 compared to negative control IgG. FIG. 11C shows the effect on clot formation from platelet poor plasma in the dilute PT assay of four concentrations of TFPI-106 compared to negative control IgG. The assays show a dose dependent effect of reduced clotting time and increased peak thrombin generation due to TFPI 106.

FIGS. 12A, 12B, and 12C illustrate the procoagulant effect of TFPI-106 in whole blood and plasma from a volunteer with moderate hemophilia A. FIG. 12A shows the effect on blood clotting in the ROTEM assay of two concentrations of TFPI 106 compared to negative control IgG and concentrations of recombinant FVIII sufficient to achieve 5%, 10% and 40% of normal activity. FIG. 12B shows peak thrombin generation in platelet rich plasma of three concentrations of TFPI 106 compared to negative controls and FVIII. FIG. 12C shows the effect on clot formation from platelet poor plasma in the dilute PT assay of four concentrations of TFPI 106 compared to negative control IgG. The assays show a dose dependent effect of reduced clotting time and increased peak thrombin generation due to TFPI 106.

FIGS. 13A, 13B, and 13C illustrate the procoagulant effect of TFPI-106 in whole blood and plasma from a volunteer with moderate hemophilia B. FIG. 13A shows the effect on blood clotting in the ROTEM assay of two concentrations of TFPI-106 compared to negative control IgG and concentrations of recombinant Factor IX (FIX) sufficient to achieve 5%, 10% and 40% of normal activity. FIG. 13B shows peak thrombin generation in platelet rich plasma of three concentrations of TFPI-106 compared to negative controls and FIX. FIG. 13C shows the effect on clot formation from platelet poor plasma in the dilute PT assay of four concentrations of TFPI 106 compared to negative control IgG. The assays show a dose dependent effect of reduced clotting time and increased peak thrombin generation due to TFPI-106.

FIGS. 14A, 14B, and 14C illustrate the procoagulant effect of TFPI-106 in whole blood and plasma from volunteers with moderate hemophilia A. FIG. 14A shows the effect on blood clotting in the ROTEM assay of three concentrations of TFPI-106 compared to concentrations of recombinant FVIII sufficient to achieve 5%, 10% and 40% of normal activity. Each data point represents the percent decrease in clotting time of a single volunteer's blood sample treated with TFPI-106 or FVIII, relative to clotting time of an untreated blood sample from the same volunteer. The widest horizontal bar among the data points for each treatment represents the mean percent reduction in clotting time of all volunteer samples tested. FIG. 14B shows the effect on peak thrombin generation in platelet rich plasma of three concentrations of TFPI 106 compared to FVIII. Each data point represents the percent increase in peak thrombin generation of a single volunteer's plasma sample treated with TFPI-106 or FVIII, relative to peak thrombin generation of an untreated plasma sample from the same volunteer. The widest horizontal bar among the data points for each treatment represents the mean percent increase in peak thrombin generation of all volunteer samples tested. FIG. 10 shows the effect on clot formation from platelet poor plasma in the dilute PT assay of four concentrations of TFPI 106. Each data point represents the percent decrease in clotting time of a single volunteer's plasma sample treated with TFPI-106 relative to clotting time of an untreated plasma sample from the same volunteer. The widest horizontal bar among the data points for each treatment represents the mean percent reduction in clotting time of all volunteer samples tested. The dilute PT assay showed a dose dependent decrease in clotting time caused by TFPI-106 and the thrombin generation assay showed a dose dependent increase in peak thrombin generation caused by TFPI-106.

TABLE 33 SEQUENCES SEQ ID NO: Description Sequence  10 mAb-TFPI-3 LC CDR1 RASQGISSSL A  11 mAb-TFPI-3 LC CDR2 AASTLQS  12 mAb-TFPI-3 LC CDR3 QQLDSYPLS  13 mAb-TFPI-3 VL AIQLTQSPSS LSASVGDRVT ITCRASQGIS SSLAWYQQKP CDR1, CDR2, CDR3 are GKAPKLLIYA ASTLQSGVPS RFSGSGSGTD FTLTISSLQP underlined EDFATYYCQQ LDSYPLSFGQ GTKLEIK  14 Human Ig kappa RTVAAPSVFI FPPSDEQLKS GTASVVCLLN NFYPREAKVQ constant WKVDNALQSG NSQESVTEQD SKDSTYSLSS TLTLSKADYE KHKVYACEVT HQGLSSPVTK SFNRGEC  15 mAb-TFPI-3 LC AIQLTQSPSS LSASVGDRVT ITC RASQGIS SSLA WYQQKP CDR1, 2, 3 are GKAPKLLIY A ASTLQS GVPS RFSGSGSGTD FTLTISSLQP underlined. Variable EDFATYYC QQ LDSYPLS FGQ GTKLEIKRTV AAPSVFIFPP sequence in italics SDEQLKSGTA SVVCLLNNFY PREAKVQWKV DNALQSGNSQ ESVTEQDSKD STYSLSSTLT LSKADYEKHK VYACEVTHQG LSSPVTKSFN RGEC  16 mAb-TFPI-3 HC CDR1 GYTFTGYYMH  17 mAb-TFPI-3 HC CDR2 WINPNSGGTN YAQKFQG  18 mAb-TFPI-3 HC CDR3 GIARLQWLPT EADFDY  19 mAb-TFPI-3 HL QVQLVQSGAE VKKPGASVKV SCKASGYTFT GYYMHWVRQA CDR1, CDR2, CDR3 are PGQGLEWMGW INPNSGGTNY AQKFQGRVTM TRDTSISTAY underlined MELSRLRSDD TAVYYCARGI ARLQWLPTEA DFDYWGQGTL VTVSS  20 Human IgG1 constant ASTKGPSVFP LAPSSKSTSG GTAALGCLVK DYFPEPVTVS heavy chain WNSGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTQT Effector function YICNVNHKPS NTKVDKKVEP KSCDKTHTCP PCPAPEAAGA mutations: L117A, PSVFLFPPKP KDTLMISRTP EVTCVVVDVS HEDPEVKFNW L118A, G120A are YVDGVEVHNA KTKPREEQYN STYRVVSVLT VLHQDWLNGK underlined. C- EYKCKVSNKA LPAPIEKTIS KAKGQPREPQ VYTLPPSREE terminal lysine MTKNQVSLTC LVKGFYPSDI AVEWESNGQP ENNYKTTPPV deleted. LDSDGSFFLY SKLTVDKSRW QQGNVFSCSV MHEALHNHYT QKSLSLSPG  21 mAb-TFPI-3 HC QVQLVQSGAE VKKPGASVKV SCKASGYTFT GYYMHWVRQA CDR1, CDR2 and CDR3 PGQGLEWMGW INPNSGGTNY AQKFQGRVTM TRDTSISTAY underlined. Variable MELSRLRSDD TAVYYCARGI ARLQWLPTEA DFDYWGQGTL sequence in italics. VTVSSASTKG PSVFPLAPSS KSTSGGTAAL GCLVKDYFPE Effector function PVTVSWNSGA LTSGVHTFPA VLQSSGLYSL SSVVTVPSSS mutations in bold. LGTQTYICNV NHKPSNTKVD KKVEPKSCDK THTCPPCPAP EAAGAPSVFL FPPKPKDTLM ISRTPEVTCV VVDVSHEDPE VKFNWYVDGV EVHNAKTKPR EEQYNSTYRV VSVLTVLHQD WLNGKEYKCK VSNKALPAPI EKTISKAKGQ PREPQVYTLP PSREEMTKNQ VSLTCLVKGF YPSDIAVEWE SNGQPENNYK TTPPVLDSDG SFFLYSKLTV DKSRWQQGNV FSCSVMHEAL HNHYTQKSLS LSPG  22 mAb-TFPI-21 LC CDR1 TGSSSNIGAG YDVH  23 mAb-TFPI-21 LC CDR2 GNSNRPS  24 mAb-TFPI-21 LC CDR3 QSYDSSLSGS VV  25 mAb-TFPI-21 VL QSVLTQPPSV SGAPGQRVTI SCTGSSSNIG AGYDVHWYQQ CDR1, CDR2, CDR3 are LPGTAPKLLI YGNSNRPSGV PDRFSGSKSG TSASLAITGL underlined QAEDEADFYC QSYDSSLSGS VVFGGGTKVT VLG  26 Human Ig lamda CL QPKAAPSVT LFPPSSEELQ ANKATLVCLI SDFYPGAVTVA WKADSSPVKA GVETTTPSKQ SNNKYAASSY LSLTPEQWKS HRSYSCQVTH EGSTVEKTVA PTECS  27 mAb-TFPI-21 LC QSVLTQPPSV SGAPGQRVTI SC TGSSSNIG AGYDVH WYQQ CDR1, 2, 3 are LPGTAPKLLI Y GNSNRPS GV PDRFSGSKSG TSASLAITGL underlined. Variable QAEDEADFYC  QSYDSSLSGS VV FGGGTKVT VLGQPKAAP sequence in italics SVTLFPPSSE ELQANKATLV CLISDFYPGA VTVAWKADSS PVKAGVETTT PSKQSNNKYA ASSYLSLTPE QWKSHRSYSC QVTHEGSTVE KTVAPTECS  28 mAb-TFPI-21 HC CDR1 GFTFSSYAMS  29 mAb-TFPI-21 HC CDR2 AISGSGGSTY YADSVKG  30 mAb-TFPI-21 HC CDR3 LGATSLSAFD I  31 mAb-TFPI-21 VH QVQLVESGGG LVQPGGSLRL SCAASGFTFS SYAMSWVRQA PGKGLEWVSA ISGSGGSTYY ADSVKGRFTI SRDNSKNTLY LQMNSLRAED TAVYYCAILG ATSLSAFDIW GQGTMVTVSS  32 mAb-TFPI-21 HC QVQLVESGGG LVQPGGSLRL SCAASGFTFS SYAMSWVRQA CDR1, CDR2 and CDR3 PGKGLEWVSA ISGSGGSTYY ADSVKGRFTI SRDNSKNTLY underlined. Variable LQMNSLRAED TAVYYCAILG ATSLSAFDIW GQGTMVTVSS sequence in italics. ASTKGPSVFP LAPSSKSTSG GTAALGCLVK DYFPEPVTVS Effector function WNSGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTQT mutations in bold. YICNVNHKPS NTKVDKKVEP KSCDKTHTCP PCPAPEAAGA PSVFLFPPKP KDTLMISRTP EVTCVVVDVS HEDPEVKFNW YVDGVEVHNA KTKPREEQYN STYRVVSVLT VLHQDWLNGK EYKCKVSNKA LPAPIEKTIS KAKGQPREPQ VYTLPPSREE MTKNQVSLTC LVKGFYPSDI AVEWESNGQP ENNYKTTPPV LDSDGSFFLY SKLTVDKSRW QQGNVFSCSV MHEALHNHYT QKSLSLSPG  33 mAb-TFPI-23 LC CDR1 TGSSSNIGAG YDVH  34 mAb-TFPI-23 LC CDR2 GNSNRPS  35 mAb-TFPI-23 LC CDR3 QSYDSSLSGS GV  36 mAb-TFPI-23 VL QSVLTQPPSV SGAPGQRVTI SCTGSSSNIG AGYDVHWYQQ CDR1, CDR2, CDR3 are LPGTAPKLLI YGNSNRPSGV PDRFSGSKSG TSASLAITGL underlined QAEDEADYYC QSYDSSLSGS GVFGGGTKLT VLG  37 mAb-TFPI-23 LC QSVLTQPPSV SGAPGQRVTI SC TGSSSNIG AGYDVH WYQQ CDR1, 2, 3 are LPGTAPKLLI Y GNSNRPS GV PDRFSGSKSG TSASLAITGL underlined. Variable QAEDEADYYC  QSYDSSLSGS GV FGGGTKLT VLGQPKAAPS sequence in italics VTLFPPSSEE LQANKATLVC LISDFYPGAV TVAWKADSSP VKAGVETTTP SKQSNNKYAA SSYLSLTPEQ WKSHRSYSCQ VTHEGSTVEK TVAPTECS  38 mAb-TFPI-23 HC CDR1 GFTFSSYAMS  39 mAb-TFPI-23 HC CDR2 AISGSGGSTY YADSVKG  40 mAb-TFPI-23 HC CDR3 LGATSLSAFD I  41 mAb-TFPI-23 VH QVQLVESGGG LVQPGGSLRL SCAASGFTFS SYAMSWVRQA PGKGLEWVSA ISGSGGSTYY ADSVKGRFTI SRDNSKNTLY LQMNSLRAED TAVYYCAILG ATSLSAFDIW GQGTMVTVSS  42 mAb-TFPI-23 HC QVQLVESGGG LVQPGGSLRL SCAAS GFTFS SYAMS WVRQA CDR1, CDR2 and CDR3 PGKGLEWVS A ISGSGGSTYY ADSVKG RFTI SRDNSKNTLY underlined. Variable LQMNSLRAED TAVYYCAI LG ATSLSAFDI W GQGTMVTVSS sequence in italics. ASTKGPSVFP LAPSSKSTSG GTAALGCLVK DYFPEPVTVS Effector function WNSGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTQT mutations in bold. YICNVNHKPS NTKVDKKVEP KSCDKTHTCP PCPAPEAAGA PSVFLFPPKP KDTLMISRTP EVTCVVVDVS HEDPEVKFNW YVDGVEVHNA KTKPREEQYN STYRVVSVLT VLHQDWLNGK EYKCKVSNKA LPAPIEKTIS KAKGQPREPQ VYTLPPSREE MTKNQVSLTC LVKGFYPSDI AVEWESNGQP ENNYKTTPPV LDSDGSFFLY SKLTVDKSRW QQGNVFSCSV MHEALHNHYT QKSLSLSPG  43 mAb-TFPI-24 LC CDR1 SGSTSNIGTM YVH  44 mAb-TFPI-24 LC CDR2 RNNHRPS  45 mAb-TFPI-24 LC CDR3 LAWDDTLRAY V  46 mAb-TFPI-24 VL QSVLTQPPSV SGTPGQRVTI SCSGSTSNIG TMYVHWYQHV CDR1, CDR2, CDR3 are PGTAPKLLIY RNNHRPSGVP DRFSGSKSGT SGSLAISGLR underlined SEDEADYYCL AWDDTLRAYV FGTGTKVTVL G  47 mAb-TFPI-24 LC QSVLTQPPSV SGTPGQRVTI SC SGSTSNIG TMYVH WYQHV CDR1, 2, 3 are PGTAPKLLIY  RNNHRPS GVP DRFSGSKSGT SGSLAISGLR underlined. Variable SEDEADYYC L AWDDTLRAYV  FGTGTKVTVL GQPKAAPSVT sequence in italics LFPPSSEELQ ANKATLVCLI SDFYPGAVTV AWKADSSPVK AGVETTTPSK QSNNKYAASS YLSLTPEQWK SHRSYSCQVT HEGSTVEKTV APTECS  48 mAb-TFPI-24 HC CDR1 GLTIDNYAMQ  49 mAb-TFPI-24 HC CDR2 GISGNSRSIG YADSVKG  50 mAb-TFPI-24 HC CDR3 FLHESDY  51 mAb-TFPI-24 VH EVQLVESGGG SVQPGRSLRL SCAVSGLTID NYAMQWVRQR CDR1, CDR2, CDR3 are PGKGLEWVSG ISGNSRSIGY ADSVKGRLTI SRDNAKNSLY underlined LQIDSLRADD TALYYCAIFL HESDYWGQGT LVTVSS  52 mAb-TFPI-24 HC EVQLVESGGG SVQPGRSLRL SCAVS GLTID NYAMQ WVRQR CDR1, CDR2 and CDR3 PGKGLEWVS G ISGNSRSIGY ADSVKG RLTI SRDNAKNSLY underlined. Variable LQIDSLRADD TALYYCAI FL HESDY WGQGT LVTVSSASTK sequence in italics. GPSVFPLAPS SKSTSGGTAA LGCLVKDYFP EPVTVSWNSG Effector function ALTSGVHTFP AVLQSSGLYS LSSVVTVPSS SLGTQTYICN mutations in bold. VNHKPSNTKV DKKVEPKSCD KTHTCPPCPA PEAAGAPSVF LFPPKPKDTL MISRTPEVTC VVVDVSHEDP EVKFNWYVDG VEVHNAKTKP REEQYNSTYR VVSVLTVLHQ DWLNGKEYKC KVSNKALPAP IEKTISKAKG QPREPQVYTL PPSREEMTKN QVSLTCLVKG FYPSDIAVEW ESNGQPENNY KTTPPVLDSD GSFFLYSKLT VDKSRWQQGN VFSCSVMHEA LHNHYTQKSL SLSPG  53 mAb-TFPI-26 LC CDR1 TGSSSNLGAD YDVQ  54 mAb-TFPI-26 LC CDR2 GNNNRPS  55 mAb-TFPI-26 LC CDR3 QSYDRSLSGS MV  56 mAb-TFPI-26 VL QSVLTQPPSL SGAPGQRVTI SCTGSSSNLG ADYDVQWYQQ CDR1, CDR2, CDR3 are LPGTAPKLLI FGNNNRPSGV PDRFSGSRSG TSASLAITGL underlined QAEDEANYYC QSYDRSLSGS MVFGGGTKLT VLG  57 mAb-TFPI-26 LC QSVLTQPPSL SGAPGQRVTI SC TGSSSNLG ADYDVQ WYQQ CDR1, 2, 3 are LPGTAPKLLI F GNNNRPS GV PDRFSGSRSG TSASLAITGL underlined. Variable QAEDEANYYC  QSYDRSLSGS MV FGGGTKLT VLGQPKAAP sequence in italics SVTLFPPSSE ELQANKATLV CLISDFYPGA VTVAWKADSS PVKAGVETTT PSKQSNNKYA ASSYLSLTPE QWKSHRSYSC QVTHEGSTVE KTVAPTECS  58 mAb-TFPI-26 HC CDR1 GFTFSSYAMS  59 mAb-TFPI-26 HC CDR2 AISGSGGSTY YADSVKG  60 mAb-TFPI-26 HC CDR3 NGAAAAWDY  61 mAb-TFPI-26 VH EVQLVESGGG LVQPGGSLRL SCAASGFTFS SYAMSWVRQA CDR1, CDR2, CDR3 are PGKGLEWVSA ISGSGGSTYY ADSVKGRFTI SRDNSKNTLY underlined LQMNSLRAED TAVYYCANNG AAAAWDYWGQ GTLVTVSS  62 mAb-TFPI-26 HC EVQLVESGGG LVQPGGSLRL SCAAS GFTFS SYAMS WVRQA CDR1, CDR2 and CDR3 PGKGLEWVS A ISGSGGSTYY ADSVKG RFTI SRDNSKNTLY underlined. Variable LQMNSLRAED TAVYYCAN NG AAAAWDY WGQ GTLVTVSSAS sequence in italics. TKGPSVFPLA PSSKSTSGGT AALGCLVKDY FPEPVTVSWN Effector function SGALTSGVHT FPAVLQSSGL YSLSSVVTVP SSSLGTQTYI mutations in bold. CNVNHKPSNT KVDKKVEPKS CDKTHTCPPC PAPEAAGAPS VFLFPPKPKD TLMISRTPEV TCVVVDVSHE DPEVKFNWYV DGVEVHNAKT KPREEQYNST YRVVSVLTVL HQDWLNGKEY KCKVSNKALP APIEKTISKA KGQPREPQVY TLPPSREEMT KNQVSLTCLV KGFYPSDIAV EWESNGQPEN NYKTTPPVLD SDGSFFLYSK LTVDKSRWQQ GNVFSCSVMH EALHNHYTQK SLSLSPG  63 mAb-TFPI-106 VH EVQLLESGGG LVQPGGSLRL SCAASGFTFS SYAMSWVRQA SEQ 26 with Q1E, V5L PGKGLEWVSA ISGSGGSTYY ADSVKGRFTI SRDNSKNTLY mutations in bold LQMNSLRAED TAVYYCAILG ATSLSAFDIW GQGTMVTVSS  64 mAb-TFPI-106 HC

VQL L ESGGG LVQPGGSLRL SCAAS GFTFS SYAMS WVRQA CDR1, CDR2 and CDR3 PGKGLEWVS A ISGSGGSTYY ADSVKG RFTI SRDNSKNTLY underlined. Variable LQMNSLRAED TAVYYCAI LG ATSLSAFDI W GQGTMVTVSS sequence in italics. ASTKGPSVFP LAPSSKSTSG GTAALGCLVK DYFPEPVTVS Q1E,V5L mutations in WNSGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTQT bold YICNVNHKPS NTKVDKKVEP KSCDKTHTCP PCPAPEAAGA PSVFLFPPKP KDTLMISRTP EVTCVVVDVS HEDPEVKFNW YVDGVEVHNA KTKPREEQYN STYRVVSVLT VLHQDWLNGK EYKCKVSNKA LPAPIEKTIS KAKGQPREPQ VYTLPPSREE MTKNQVSLTC LVKGFYPSDI AVEWESNGQP ENNYKTTPPV LDSDGSFFLY SKLTVDKSRW QQGNVFSCSV MHEALHNHYT QKSLSLSPG  65 mAb-TFPI-107 VH EVQLLESGGG LVQPGGSLRL SCAASGFTFS SYAMSWVRQA SEQ 26 with Q1E, PGKGLEWVSA ISGSGGSTYY ADSVKGRFTI SRDNSKNTLY V5L, I94K mutations LQMNSLRAED TAVYYCAK LG ATSLSAFDIW GQGTMVTVSS in bold  66 mAb-TFPI-107 HC

VQL L ESGGG LVQPGGSLRL SCAAS GFTFS SYAMS WVRQA CDR1, CDR2 and CDR3 PGKGLEWVS A ISGSGGSTYY ADSVKG RFTI SRDNSKNTLY underlined. Variable LQMNSLRAED TAVYYCA

LG ATSLSAFDI W GQGTMVTVSS sequence in italics. ASTKGPSVFP LAPSSKSTSG GTAALGCLVK DYFPEPVTVS Q1E, V5L, I94K WNSGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTQT mutations in bold YICNVNHKPS NTKVDKKVEP KSCDKTHTCP PCPAPEAAGA PSVFLFPPKP KDTLMISRTP EVTCVVVDVS HEDPEVKFNW YVDGVEVHNA KTKPREEQYN STYRVVSVLT VLHQDWLNGK EYKCKVSNKA LPAPIEKTIS KAKGQPREPQ VYTLPPSREE MTKNQVSLTC LVKGFYPSDI AVEWESNGQP ENNYKTTPPV LDSDGSFFLY SKLTVDKSRW QQGNVFSCSV MHEALHNHYT QKSLSLSPG  67 mAb-TFPI-108 VH EVQLVESGGG  L VQPGRSLRL SCAVSGLTID NYAMQWVRQ A CDR1, CDR2, CDR3 are PGKGLEWVSG ISGNSRSIGY ADSVKGR F TI SRDNAKNSLY underlined. LQ MN SLRA E D TALYYCAIFL HESDYWGQGT LVTVSS SEQ 38 with S11L, R40A, L67F, I82M, D82aN, D85E mutations in bold  68 mAb-TFPI-108 HC EVQLVESGGG 

VQPGRSLRL SCAVS GLTID NYAMQ WVRQ

CDR1, CDR2 and CDR3 PGKGLEWVS G ISGNSRSIGY ADSVKG R

TI SRDNAKNSLY underlined. Variable LQ

SLRA

D TALYYCAI FL HESDY WGQGT LVTVSSASTK sequence in italics. GPSVFPLAPS SKSTSGGTAA LGCLVKDYFP EPVTVSWNSG S11L, R40A, L67F, ALTSGVHTFP AVLQSSGLYS LSSVVTVPSS SLGTQTYICN I82M, D82aN, D85E VNHKPSNTKV DKKVEPKSCD KTHTCPPCPA PEAAGAPSVF mutations in bold LFPPKPKDTL MISRTPEVTC VVVDVSHEDP EVKFNWYVDG VEVHNAKTKP REEQYNSTYR VVSVLTVLHQ DWLNGKEYKC KVSNKALPAP IEKTISKAKG QPREPQVYTL PPSREEMTKN QVSLTCLVKG FYPSDIAVEW ESNGQPENNY KTTPPVLDSD GSFFLYSKLT VDKSRWQQGN VFSCSVMHEA LHNHYTQKSL SLSPG  69 mAb-TFPI-109 VH EVQLVESGGG LVQPGRSLRL SCAASGLTID NYAMQWVRQA CDR1, CDR2, CDR3 are PGKGLEWVSG ISGNSRSIGY ADSVKGRLTI SRDNAKNSLY underlined. LQMNSLRAED TALYYCAIFL HESDYWGQGT LVTVSS SEQ 38 with S11L, V24A, R40A, I82M, D82aN, D85E mutations in bold  70 mAb-TFPI-109 HC EVQLVESGGG 

VQPGRSLRL SCA

S GLTID NYAMQ WVRQ

CDR1, CDR2 and CDR3 PGKGLEWVS G ISGNSRSIGY ADSVKG RLTI SRDNAKNSLY underlined. Variable LQ

SLRA

D TALYYCAI FL HESDY WGQGT LVTVSSASTK sequence in italics. GPSVFPLAPS SKSTSGGTAA LGCLVKDYFP EPVTVSWNSG S11L, V24A, R40A, ALTSGVHTFP AVLQSSGLYS LSSVVTVPSS SLGTQTYICN I82M, D82aN, D85E VNHKPSNTKV DKKVEPKSCD KTHTCPPCPA PEAAGAPSVF mutations in bold LFPPKPKDTL MISRTPEVTC VVVDVSHEDP EVKFNWYVDG VEVHNAKTKP REEQYNSTYR VVSVLTVLHQ DWLNGKEYKC KVSNKALPAP IEKTISKAKG QPREPQVYTL PPSREEMTKN QVSLTCLVKG FYPSDIAVEW ESNGQPENNY KTTPPVLDSD GSFFLYSKLT VDKSRWQQGN VFSCSVMHEA LHNHYTQKSL SLSPG  71 mAb-TFPI-110 VL QSVLTQPPSA SGTPGQRVTI SCSGSTSNIG TMYVHWYQHL CDR1, CDR2, CDR3 are PGTAPKLLIY RNNHRPSGVP DRFSGSKSGT SASLAISGLR underlined. SEDEADYYCL AWDDTLRAYV FGTGTKVTVL G SEQ 32 with V10A, V39L, G71A mutations in bold.  72 mAb-TFPI-110 LC QSVLTQPPS

 SGTPGQRVTI SC SGSTSNIG TMYVH WYQH

CDR1, 2, 3 are PGTAPKLLIY  RNNHRPS GVP DRFSGSKSGT S

SLAISGLR underlined. Variable SEDEADYYC L AWDDTLRAYV  FGTGTKVTVL GQPKAAPSVT sequence in italics. LFPPSSEELQ ANKATLVCLI SDFYPGAVTV AWKADSSPVK V10A, V39L, G71A AGVETTTPSK QSNNKYAASS YLSLTPEQWK SHRSYSCQVT mutations in bold. HEGSTVEKTV APTECS  73 mAb-TFPI-111 VL QSVLTQPPSA SGTPGQRVTI SCSGSTSNIG TMYVHWYQQL CDR1, CDR2, CDR3 are PGTAPKLLIY RNNHRPSGVP DRFSGSKSGT SGSLAISGLR underlined. SEDEADYYCL AWDDTLRAYV FGTGTKVTVL G SEQ 32 with V10A, H38Q, V39L mutations in bold.  74 mAb-TFPI-111 LC QSVLTQPPS

 SGTPGQRVTI SC SGSTSNIG TMYVH WYQ

CDR1, 2, 3 are PGTAPKLLIY  RNNHRPS GVP DRFSGSKSGT SGSLAISGLR underlined. Variable SEDEADYYC L AWDDTLRAYV  FGTGTKVTVL GQPKAAPSVT sequence in italics. LFPPSSEELQ ANKATLVCLI SDFYPGAVTV AWKADSSPVK V10A, H38Q, V39L AGVETTTPSK QSNNKYAASS YLSLTPEQWK SHRSYSCQVT mutations in bold. HEGSTVEKTV APTECS  75 mAb-TFPI-112 VL QSVLTQPPSA SGTPGQRVTI SCSGSTSNIG TMYVHWYQHL CDR1, CDR2, CDR3 are PGTAPKLLIY RNNHRPSGVP DRFSGSKSGT SGSLAISGLR underlined. SEDEADYYCL AWDDTLRAYV FGTGTKVTVL G SEQ 32 with V10A, V39L mutations in bold.  76 mAb-TFPI-112 LC QSVLTQPPS

 SGTPGQRVTI SC SGSTSNIG TMYVH WYQH

CDR1, 2, 3 are PGTAPKLLIY  RNNHRPS GVP DRFSGSKSGT SGSLAISGLR underlined. Variable SEDEADYYC L AWDDTLRAYV  FGTGTKVTVL GQPKAAPSVT sequence in italics. LFPPSSEELQ ANKATLVCLI SDFYPGAVTV AWKADSSPVK V10A, V39L mutations AGVETTTPSK QSNNKYAASS YLSLTPEQWK SHRSYSCQVT in bold. HEGSTVEKTV APTECS  77 mAb-TFPI-113 VL QSVLTQPPSA SGTPGQRVTI SCSGSTSNIG TMYVHWYQQL CDR1, CDR2, CDR3 are PGTAPKLLIY RNNHRPSGVP DRFSGSKSGT SASLAISGLR underlined. SEDEADYYCL AWDDTLRAYV FGTGTKVTVL G SEQ 32 with V10A, H38Q, V39L, G71A mutations in bold.  78 mAb-TFPI-113 LC QSVLTQPPS

 SGTPGQRVTI SC SGSTSNIG TMYVH WYQ

CDR1, 2, 3 are PGTAPKLLIY  RNNHRPS GVP DRFSGSKSGT S

SLAISGLR underlined. Variable SEDEADYYC L AWDDTLRAYV  FGTGTKVTVL GQPKAAPSVT sequence in italics. LFPPSSEELQ ANKATLVCLI SDFYPGAVTV AWKADSSPVK V11A, H38Q, V39L, AGVETTTPSK QSNNKYAASS YLSLTPEQWK SHRSYSCQVT G71A mutations in HEGSTVEKTV APTECS bold.  79 mAb-TFPI-114 HC VH EVQLVESGGG LVQPGRSLRL SCAVSGLTID NYAMQWVRQA CDR1, CDR2, CDR3 are PGKGLEWVSG ISGNSRSIGY ADSVKGRLTI SRDNAKNSLY underlined. LQMNSLRAED TALYYCAIFL HESDYWGQGT LVTVSS SEQ 38 with S11L, R40A, I82M, D82AN, D85E mutations in bold  80 mAb-TFPI-114 HC EVQLVESGGG 

VQPGRSLRL SCAVS GLTID NYAMQ WVRQ

CDR1, CDR2 and CDR3 PGKGLEWVS G ISGNSRSIGY ADSVKG RLTI SRDNAKNSLY underlined. Variable LQ

SLRA

D TALYYCAI FL HESDY WGQGT LVTVSSASTK sequence in italics. GPSVFPLAPS SKSTSGGTAA LGCLVKDYFP EPVTVSWNSG S11L, R40A, I82M, ALTSGVHTFP AVLQSSGLYS LSSVVTVPSS SLGTQTYICN D82AN, D85E VNHKPSNTKV DKKVEPKSCD KTHTCPPCPA PEAAGAPSVF mutations in bold LFPPKPKDTL MISRTPEVTC VVVDVSHEDP EVKFNWYVDG VEVHNAKTKP REEQYNSTYR VVSVLTVLHQ DWLNGKEYKC KVSNKALPAP IEKTISKAKG QPREPQVYTL PPSREEMTKN QVSLTCLVKG FYPSDIAVEW ESNGQPENNY KTTPPVLDSD GSFFLYSKLT VDKSRWQQGN VFSCSVMHEA LHNHYTQKSL SLSPG  81 mouse 4d8.b1 VL CDR1 KASQDVHTAV A  82 mouse 4d8.b1 VL CDR2 WASTRHT  83 mouse 4d8.b1 VL CDR3 QQHYTTPYT  84 mouse 4d8.b1 VL DIVMTQSHKF MSTSVGDRVS ITCKASQDVH TAVAWYQQKP CDR1, CDR2, CDR3 GQSPRLLIYW ASTRHTGVPD RFTGCGSGTD YTLTISSVQA underlined EDLALYYCQQ HYTTPYTFGG GTKLEMK  85 Mouse Ig kappa ADAAPTVSIF PPSSEQLTSG GASVVCFLNN FYPKDINVKW constant KIDGSERQNG VLNSWTDQDS KDSTYSMSST LTLTKDEYER HNSYTCEATH KTSTSPIVKS FNRNEC  86 mouse 4d8.b1 LC DIVMTQSHKF MSTSVGDRVS ITC KASQDVH TAVA WYQQKP CDR1, CDR2, CDR3 GQSPRLLIY W ASTRHT GVPD RFTGCGSGTD YTLTISSVQA underlined EDLALYYC QQ HYTTPYT FGG GTKLEMKADA APTVSIFPPS Variable sequence in SEQLTSGGAS VVCFLNNFYP KDINVKWKID GSERQNGVLN italics SWTDQDSKDS TYSMSSTLTL TKDEYERHNS YTCEATHKTS TSPIVKSFNR NEC  87 mouse 4d8.b1 VH CDR1 GYTFTDYNLD  88 mouse 4d8.b1 VH CDR2 DINPINGATL YNQKFKG  89 mouse 4d8.b1 VH CDR3 YYGDYDAMDY  90 mouse 4d8.b1 VH EVLLQQSGPE LVKPGASVKI PCKASGYTFT DYNLDWVKQS CDR1, CDR2, CDR3 HGKSLEWIGD INPINGATLY NQKFKGKATL TVDQSSSTAY underlined MELRSLTSED TAVYYCSIYY GDYDAMDYWG QGASVTVSS  91 Mouse Igh constant AKTTPPSVYP LAPGSAAQTN SMVTLGCLVK GYFPEPVTVT heavy WNSGSLSSGV HTFPAVLQSD LYTLSSSVTV PSSTWPSETV TCNVAHPASS TKVDKKIVPR DCGCKPCICT VPEVSSVFIF PPKPKDVLTI TLTPKVTCVV VDISKDDPEV QFSWFVDDVE VHTAQTQPRE EQFNSTFRSV SELPIMHQDW LNGKEFKCRV NSAAFPAPIE KTISKTKGRP KAPQVYTIPP PKEQMAKDKV SLTCMITDFF PEDITVEWQW NGQPAENYKN TQPIMDTDGS YFVYSKLNVQ KSNWEAGNTF TCSVLHEGLH NHHTEKSLSH SPGK  92 mouse 4d8.b1 HC EVLLQQSGPE LVKPGASVKI PCKAS GYTFT DYNLD WVKQS CDR1, CDR2, CDR3 HGKSLEWIG D INPINGATLY NQKFKG KATL TVDQSSSTAY underlined MELRSLTSED TAVYYCSI YY GDYDAMDY WG QGASVTVSSA Variable sequence in KTTPPSVYPL APGSAAQTNS MVTLGCLVKG YFPEPVTVTW italics NSGSLSSGVH TFPAVLQSDL YTLSSSVTVP SSTWPSETVT CNVAHPASST KVDKKIVPRD CGCKPCICTV PEVSSVFIFP PKPKDVLTIT LTPKVTCVVV DISKDDPEVQ FSWFVDDVEV HTAQTQPREE QFNSTFRSVS ELPIMHQDWL NGKEFKCRVN SAAFPAPIEK TISKTKGRPK APQVYTIPPP KEQMAKDKVS LTCMITDFFP EDITVEWQWN GQPAENYKNT QPIMDTDGSY FVYSKLNVQK SNWEAGNTFT CSVLHEGLHN HHTEKSLSHS PGK  93 Mu-hu 4d8 chimera LC DIVMTQSHKF MSTSVGDRVS ITC KASQDVH TAVA WYQQKP CDR1, 2, 3 are GQSPRLLIY W ASTRHT GVPD RFTGCGSGTD YTLTISSVQA underlined. Variable EDLALYYC QQ HYTTPYT FGG GTKLEMKRTV AAPSVFIFPP sequence in italics SDEQLKSGTA SVVCLLNNFY PREAKVQWKV DNALQSGNSQ ESVTEQDSKD STYSLSSTLT LSKADYEKHK VYACEVTHQG LSSPVTKSFN RGEC  94 Mu-hu 4d8 chimera HC EVLLQQSGPE LVKPGASVKI PCKAS GYTFT DYNLD WVKQS CDR1, 2, 3 are HGKSLEWIG D INPINGATLY NQKFKGKATL TVDQSSSTAY underlined. Variable MELRSLTSED TAVYYCSI YY GDYDAMDY WG QGASVTVSSA sequence in italics STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY ICNVNHKPSN TKVDKKVEPK SCDKTHTCPP CPAPEAAGAP SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLTCL VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLYS KLTVDKSRWQ QGNVFSCSVM HEALHNHYTQ KSLSLSPG  95 4d8-VH1.0 VH EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWVAD INPINGATLY NQKFKGRFTI SRDNAKNSLY underlined LQMNSLRAED TAVYYCARYY GDYDAMDYWG QGTLVTVSS  96 4d8-VH1.0 HC EVQLVESGGG LVQPGGSLRL SCAAS GYTFT DYNLD WVRQA CDR1, CDR2, CDR3 PGKGLEWVA D INPINGATLY NQKFKG RFTI SRDNAKNSLY underlined LQMNSLRAED TAVYYCAR YY GDYDAMDY WG QGTLVTVSSA Variable sequence in STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW italics NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY ICNVNHKPSN TKVDKKVEPK SCDKTHTCPP CPAPEAAGAP SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLTCL VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLYS KLTVDKSRWQ QGNVFSCSVM HEALHNHYTQ KSLSLSPG  97 4d8-VH1.1 VH EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWVG D INPINGATLY NQKFKGRATI SVDQAKNSAY underlined LQMNSLRAED TAVYYCARYY GDYDAMDYWG QGTLVTVSS Back mutations A49G, F67A, R71V, N73Q, L78A are in bold  98 4d8-VH1.1 HC EVQLVESGGG LVQPGGSLRL SCAAS GYTFT DYNLD WVRQA CDR1, CDR2, CDR3 PGKGLEWV

D INPINGATLY NQKFKG R

TI S

D

AKNS

Y underlined LQMNSLRAED TAVYYCAR YY GDYDAMDY WG QGTLVTVSSA Variable sequence in STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW italics NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY Back mutations A49G, ICNVNHKPSN TKVDKKVEPK SCDKTHTCPP CPAPEAAGAP F67A, R71V, N73Q, SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY L78A are in bold VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLTCL VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLYS KLTVDKSRWQ QGNVFSCSVM HEALHNHYTQ KSLSLSPG  99 4d8-VH1.2 VH EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWVG D INPINGATLY NQKFKGRFTI SRDNAKNSLY underlined LQMNSLRAED TAVYYCARYY GDYDAMDYWG QGTLVTVSS Back mutation A49G is in bold 100 4d8-VH1.2 HC EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWV

D INPINGATLY NQKFKGRFTI SRDNAKNSLY underlined LQMNSLRAED TAVYYCARYY GDYDAMDYWG QGTLVTVSSA Variable sequence in STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW italics NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY Back mutation A49G ICNVNHKPSN TKVDKKVEPK SCDKTHTCPP CPAPEAAGAP is in bold SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL aAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLTCL VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLYS KLTVDKSRWQ QGNVFSCSVM HEALHNHYTQ KSLSLSPG 101 4d8-VH1.3 VH EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWVAD INPINGATLY NQKFKGRATI SRDNAKNSLY underlined LQMNSLRAED TAVYYCARYY GDYDAMDYWG QGTLVTVSS Back mutation F67A is in bold 102 4d8-VH1.3 HC EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWVAD INPINGATLY NQKFKGR

TI SRDNAKNSLY underlined LQMNSLRAED TAVYYCARYY GDYDAMDYWG QGTLVTVSSA Variable sequence in STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW italics NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY Back mutation F67A ICNVNHKPSN TKVDKKVEPK SCDKTHTCPP CPAPEAAGAP is in bold SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLTCL VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLYS KLTVDKSRWQ QGNVFSCSVM HEALHNHYTQ KSLSLSPG 103 4d8-VH1.4 VH EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWVAD INPINGATLY NQKFKGRFTI SRDQAKNSLY underlined LQMNSLRAED TAVYYCARYY GDYDAMDYWG QGTLVTVSS Back mutation N73Q is in bold 104 4d8-VH1.4 HC EVQLVESGGG LVQPGGSLRL SCAAS GYTFT DYNLD WVRQA CDR1, CDR2, CDR3 PGKGLEWVA D INPINGATLY NQKFKG RFTI SRD

AKNSLY underlined LQMNSLRAED TAVYYCAR YY GDYDAMDY WG QGTLVTVSSA Variable sequence in STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW italics NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY Back mutation N73Q ICNVNHKPSN TKVDKKVEPK SCDKTHTCPP CPAPEAAGAP is in bold SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL aAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLTCL VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLYS KLTVDKSRWQ QGNVFSCSVM HEALHNHYTQ KSLSLSPG 105 4d8-VH1.5 VH EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWVAD INPINGATLY NQKFKGRFTI SRDNAKNSAY underlined LQMNSLRAED TAVYYCARYY GDYDAMDYWG QGTLVTVSS Back mutation L78A is in bold 106 4d8-VH1.5 HC EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWVAD INPINGATLY NQKFKGRFTI SRDNAKNS

Y underlined LQMNSLRAED TAVYYCARYY GDYDAMDYWG QGTLVTVSSA Variable sequence in STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW italics NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY Back mutation L78A ICNVNHKPSN TKVDKKVEPK SCDKTHTCPP CPAPEAAGAP is in bold SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL aAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLTCL VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLYS KLTVDKSRWQ QGNVFSCSVM HEALHNHYTQ KSLSLSPG 107 4d8-VH1.6 VH EVQLVESGGG LVQPGGSLRL SCAASGYTFT DYNLDWVRQA CDR1, CDR2, CDR3 PGKGLEWVG D INPINGATLY NQKFKGRATI SVDQAKNSAY underlined LQMNSLRAED TAVYYCSI YY GDYDAMDYWG QGTLVTVSS Back mutations A49G, F67A, R71V, N73Q, L78A, A93S, R94I are in bold 108 4d8-VH1.6 HC EVQLVESGGG LVQPGGSLRL SCAAS GYTFT DYNLD WVRQA CDR1, CDR2, CDR3 PGKGLEWV

D INPINGATLY NQKFKG R

TI S

D

AKNS

Y underlined LQMNSLRAED TAVYYC

YY GDYDAMDY WG QGTLVTVSSA Variable sequence in STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW italics NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY Back mutations A49G, ICNVNHKPSN TKVDKKVEPK SCDKTHTCPP CPAPEAAGAP F67A, R71V, N73Q, SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY L78A, A93S, R94I are VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE in bold YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLTCL VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLYS KLTVDKSRWQ QGNVFSCSVM HEALHNHYTQ KSLSLSPG 109 4D8-VK1.0 VL DIQMTQSPSS LSASVGDRVT ITCKASQDVH TAVAWYQQKP CDR1, CDR2, CDR3 GKAPKLLIYW ASTRHTGVPS RFSGSGSGTD FTLTISSLQP underlined EDFATYYCQQ HYTTPYTFGQ GTKLEIK 110 4D8-VK1.0 LC DIQMTQSPSS LSASVGDRVT ITC KASQDVH TAVA WYQQKP CDR1, CDR2, CDR3 GKAPKLLIY W ASTRHT GVPS RFSGSGSGTD FTLTISSLQP underlined EDFATYYC QQ HYTTPYT FGQ GTKLEIKRTV AAPSVFIFPP VL in italics SDEQLKSGTA SVVCLLNNFY PREAKVQWKV DNALQSGNSQ ESVTEQDSKD STYSLSSTLT LSKADYEKHKV YACEVTHQGL SSPVTKSFNR GEC 111 4D8-VK1.1 VL DIQMTQSPSS LSASVGDRVT ITCKASQDVH TAVAWYQQKP CDR1, CDR2, CDR3 GKAPKLLIYW ASTRHTGVPS RFSGSGSGTD YTLTISSLQP underlined EDFATYYCQQ HYTTPYTFGQ GTKLEIK Back mutation F71Y is in bold 112 4D8-VK1.1 LC DIQMTQSPSS LSASVGDRVT ITC KASQDVH TAVA WYQQKP CDR1, CDR2, CDR3 GKAPKLLIY W ASTRHT GVPS RFSGSGSGTD YTLTISSLQP underlined EDFATYYC QQ HYTTPYT FGQ GTKLEIKRTV AAPSVFIFPP VL in italics SDEQLKSGTA SVVCLLNNFY PREAKVQWKV DNALQSGNSQ ESVTEQDSKD STYSLSSTLT LSKADYEKHKV YACEVTHQGL SSPVTKSFNR GEC 113 mouse 6b7.c5 VL CDR1 KASQDVITAV A 114 mouse 6b7.c5 VL CDR2 WASTRHT 115 mouse 6b7.c5 VL CDR3 QQHYSTPYT 116 mouse 6b7.c5 VL DIVMTQSHKF MSTSVGDRVS ITCKASQDVI TAVAWYQQKP CDR1, CDR2, CDR3 GQSPKLLIYW ASTRHTGVPV RFTGSGSGTD YTLTIISVQA underlined EDLALYYCQQ HYSTPYTFGG GTKLEIK 117 mouse 6b7.c5 LC DIVMTQSHKF MSTSVGDRVS ITC KASQDVI TAVA WYQQKP CDR1, CDR2, CDR3 GQSPKLLIY W ASTRHT GVPV RFTGSGSGTD YTLTIISVQA underlined EDLALYYC QQ HYSTPYT FGG GTKLEIKADA APTVSIFPPS Variable sequence in SEQLTSGGAS VVCFLNNFYP KDINVKWKID GSERQNGVLN italics SWTDQDSKDS TYSMSSTLTL TKDEYERHNS YTCEATHKTS TSPIVKSFNR NEC 118 mouse 6b7.c5 VH CDR1 GYTFTDYTMD 119 mouse 6b7.c5 VH CDR2 DINPSNGGSI YNRKFKG 120 mouse 6b7.c5 VH CDR3 MHYNYDGFPY 121 mouse 6b7.c5 VH EVLLQQSGPE LVKPGSSVKI PCKASGYTFT DYTMDWVKQS CDR1, CDR2, CDR3 HGKSLEWIGD INPSNGGSIY NRKFKGKATL TVDKSSSTAY underlined MELRSLTSED TAVYYCARMH YNYDGFPYWG QGTLVTVSA 122 mouse 6b7.c5 HC EVLLQQSGPE LVKPGSSVKI PCKAS GYTFT DYTMD WVKQS CDR1, CDR2, CDR3 HGKSLEWIG D INPSNGGSIY NRKFKG RATL TVDKSSSTAY underlined MELRSLTSED TAVYYCAR MH YNYDGFPY WG QGTLVTVSAA Variable sequence in STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW italics NSGALTSGVH TFPAVLQSSG LYSLSSVVTV PSSSLGTQTY ICNVNHKPSN TKVDKKVEPK SCDKTHTCPP CPAPEAAGAP SVFLFPPKPK DTLMISRTPE VTCVVVDVSH EDPEVKFNWY VDGVEVHNAK TKPREEQYNS TYRVVSVLTV LHQDWLNGKE YKCKVSNKAL PAPIEKTISK AKGQPREPQV YTLPPSREEM TKNQVSLTCL VKGFYPSDIA VEWESNGQPE NNYKTTPPVL DSDGSFFLYS KLTVDKSRWQ QGNVFSCSVM HEALHNHYTQ KSLSLSPG 123 mouse 7A4.D9 VL CDR1 RASKSVSTSG YTYMH 124 mouse 7A4.D9 VL CDR2 LASNLES 125 mouse 7A4.D9 VL CDR3 QHIRELPFT 126 mouse 7A4.D9 VL DIVLTQSPAS LAVSLGQRAT ISCRASKSVS TSGYTYMHWY CDR1, CDR2, CDR3 QQKPGQPPKL LIYLASNLES GVPARFSGSG SGTDFTLNIH underlined PVEEEDAAAY YCQHIRELPF TFGSGTKLEI K 127 mouse 7A4.D9 LC DIVLTQSPAS LAVSLGQRAT ISC RASKSVS TSGYTYMH WY CDR1, CDR2, CDR3 QQKPGQPPKL LIY LASNLES  GVPARFSGSG SGTDFTLNIH underlined PVEEEDAAAY YC QHIRELPF T FGSGTKLEI KADAAPTVSI Variable sequence in FPPSSEQLTS GGASVVCFLN NFYPKDINVK WKIDGSERQN italics GVLNSWTDQD SKDSTYSMSS TLTLTKDEYE RHNSYTCEAT HKTSTSPIVK SFNRNEC 128 mouse 7A4.D9 VH CDR1 GYTFTSYVMH 129 mouse 7A4.D9 VH CDR2 YLNPYNDGTK YNEKFKG 130 mouse 7A4.D9 VH CDR3 TLLYAMDY 131 mouse 7A4.D9 VH EVQLQQSGPE LVKPGASVKM SCKASGYTFT SYVMHWVKQK CDR1, CDR2, CDR3 PGQGLEWIGY LNPYNDGTKY NEKFKGKASL ISDKSSSTVY underlined MELSSLTSED SAVYYCATTL LYAMDYWGQG SSVTVSS 132 mouse 7A4.D9 HC EVQLQQSGPE LVKPGASVKM SCKAS GYTFT SYVMH WVKQK CDR1, CDR2, CDR3 PGQGLEWIG Y LNPYNDGTKY NEKFKG KASL ISDKSSSTVY underlined MELSSLTSED SAVYYCAT TL LYAMDY WGQG SSVTVSSAST Variable sequence in KGPSVFPLAP SSKSTSGGTA ALGCLVKDYF PEPVTVSWNS italics GALTSGVHTF PAVLQSSGLY SLSSVVTVPS SSLGTQTYIC NVNHKPSNTK VDKKVEPKSC DKTHTCPPCP APEAAGAPSV FLFPPKPKDT LMISRTPEVT CVVVDVSHED PEVKFNWYVD GVEVHNAKTK PREEQYNSTY RVVSVLTVLH QDWLNGKEYK CKVSNKALPA PIEKTISKAK GQPREPQVYT LPPSREEM 133 2A8 VL CDR1 SGDNLRNYYA H 134 2A8 VL CDR2 YDNNRPS 135 2A8 VL CDR3 QSWDDGVPV 136 2A8 VL DIELTQPPSV SVAPGQTARI SCSGDNLRNY YAHWYQQKPG CDR1, CDR2, CDR3 QAPVVVIYYD NNRPSGIPER FSGSNSGNTA TLTISGTQAE underlined DEADYYCQSW DDGVPVFGGG TKLTVLG 137 2A8 LC DIELTQPPSV SVAPGQTARI SC SGDNLRNY YAH WYQQKPG CDR1, CDR2, CDR3 QAPVVVIY YD NNRPS GIPER FSGSNSGNTA TLTISGTQAE underlined DEADYYC QSW DDGVPV FGGG TKLTVLGQPK AAPSVTLFPP Variable sequence in SSEELQANKA TLVCLISDFY PGAVTVAWKA DSSPVKAGVE italics TTTPSKQSNN KYAASSYLSL TPEQWKSHRS YSCQVTHEGS TVEKTVAPTE CS 138 2A8 VH CDR1 GFTFRSYGMS 139 2A8 VH CDR2 SIRGSSSSTY YADSVKG 140 2A8 VH CDR3 KYRYWFDY 141 2A8 VH QVQLVESGGG LVQPGGSLRL SCAASGFTFR SYGMSWVRQA CDR1, CDR2, CDR3 PGKGLEWVSS IRGSSSSTYY ADSVKGRFTI SRDNSKNTLY underlined LQMNSLRAED TAVYYCARKY RYWFDYWGQG TLVTVSS 142 2A8 HC QVQLVESGGG LVQPGGSLRL SCAAS GFTFR SYGMS WVRQA CDR1, CDR2, CDR3 PGKGLEWVS S IRGSSSSTYY ADSVKG RFTI SRDNSKNTLY underlined LQMNSLRAED TAVYYCAR KY RYWFDY WGQG TLVTVSSAST Variable sequence in KGPSVFPLAP SSKSTSGGTA ALGCLVKDYF PEPVTVSWNS italics GALTSGVHTF PAVLQSSGLY SLSSVVTVPS SSLGTQTYIC NVNHKPSNTK VDKKVEPKSC DKTHTCPPCP APEAAGAPSV FLFPPKPKDT LMISRTPEVT CVVVDVSHED PEVKFNWYVD GVEVHNAKTK PREEQYNSTY RVVSVLTVLH QDWLNGKEYK CKVSNKALPA PIEKTISKAK GQPREPQVYT LPPSREEMTK NQVSLTCLVK GFYPSDIAVE WESNGQPENN YKTTPPVLDS DGSFFLYSKL TVDKSRWQQG NVFSCSVMHE ALHNHYTQKS LSLSPG 143 2A8-200 VL CDR1 SGDNLRNYYA H 144 2A8-200 VL CDR2 YDVNRPS 145 2A8-200 VL CDR3 QSWWDGVPV 146 2A8-200 VL DIELTQPPSV SVAPGQTARI SCSGDNLRNY YAHWYQQKPG CDR1, CDR2, CDR3 QAPVVVIFYD VNRPSGIPER FSGSNSGNTA TLTISGTQAE underlined DEADYYCQSW WDGVPVFGGG TKLTVLG 147 2A8-200 LC DIELTQPPSV SVAPGQTARI SC SGDNLRNY YAH WYQQKPG CDR1, CDR2, CDR3 QAPVVVIF YD VNRPS GIPER FSGSNSGNTA TLTISGTQAE underlined DEADYYC QSW WDGVPV FGGG TKLTVLGQPK AAPSVTLFPP Variable sequence in SSEELQANKA TLVCLISDFY PGAVTVAWKA DSSPVKAGVE italics TTTPSKQSNN KYAASSYLSL TPEQWKSHRS YSCQVTHEGS TVEKTVAPTE CS 148 2A8-200 VH CDR1 GFTERSYGMD 149 2A8-200 VH CDR2 SIRGSRSSTY YADSVKG 150 2A8-200 VH CDR3 LYRYWFDY 151 2A8-200 VH QVQLVESGGG LVQPGGSLRL SCAASGFTFR SYGMDWVRQA CDR1, CDR2, CDR3 PGKGLEWVSS IRGSRSSTYY ADSVKGRFTI SRDNSKNTLY underlined LQMNSLRAED TAVYYCARLY RYWFDYWGQG TLVTVSS 152 2A8-200 HC QVQLVESGGG LVQPGGSLRL SCAAS GFTFR SYGMD WVRQA CDR1, CDR2, CDR3 PGKGLEWVS S IRGSRSSTYY ADSVKG RFTI SRDNSKNTLY underlined LQMNSLRAED TAVYYCAR LY RYWFDY WGQG TLVTVSSAST Variable sequence in KGPSVFPLAP SSKSTSGGTA ALGCLVKDYF PEPVTVSWNS italics GALTSGVHTF PAVLQSSGLY SLSSVVTVPS SSLGTQTYIC NVNHKPSNTK VDKKVEPKSC DKTHTCPPCP APEAAGAPSV FLFPPKPKDT LMISRTPEVT CVVVDVSHED PEVKFNWYVD GVEVHNAKTK PREEQYNSTY RVVSVLTVLH QDWLNGKEYK CKVSNKALPA PIEKTISKAK GQPREPQVYT LPPSREEMTK NQVSLTCLVK GFYPSDIAVE WESNGQPENN YKTTPPVLDS DGSFFLYSKL TVDKSRWQQG NVFSCSVMHE ALHNHYTQKS LSLSPG 153 3F18 VL CDR1 SGDNLRNYYA H 154 3F18 VL CDR2 YDNNRPS 155 3F18 VL CDR3 QSWDDGVPV 156 3F18 VL DIELTQPPSV SVAPGQTARI SCSGDNLRNY YAHWYQQKPG CDR1, CDR2, CDR3 QAPVVVIYYD NNRPSGIPER FSGSNSGNTA TLTISGTQAE underlined DEADYYCQSW DDGVPVFGGG TKLTVLG 157 Mouse Ig lamda CL QPKAAPSVT LFPPSSEELQ ANKATLVCLI SDFYPGAVTV AWKADSSPVK AGVETTTPSK QSNNKYAASS YLSLTPEQWK SHRSYSCQVT HEGSTVEKTV APTECS 158 3F18 LC DIELTQPPSV SVAPGQTARI SC SGDNLRNY YAH WYQQKPG CDR1, CDR2, CDR3 QAPVVVIY YD NNRPS GIPER FSGSNSGNTA TLTISGTQAE underlined DEADYYC QSW DDGVPV FGGG TKLTVLGQPK AAPSVTLFPP Variable sequence in SSEELQANKA TLVCLISDFY PGAVTVAWKA DSSPVKAGVE italics TTTPSKQSNN KYAASSYLSL TPEQWKSHRS YSCQVTHEGS TVEKTVAPTE CS 159 3F18 VH CDR1 GFTFSNYALS 160 3F18 VH CDR2 SISSGGATYY PDSVEG 161 3F18 VH CDR3 GAYGSDYFDY 162 3F18 VH EVKLVESGGG LVKPGGSLRL SCAASGFTFS NYALSWVRQT CDR1, CDR2, CDR3 PDKRLEWVAS ISSGGATYYP DSVEGRFTIS RDNVRNILYL underlined QMSSLQSEDT AMYYCTRGAY GSDYFDYWGQ GTTLTVSS 163 3F18 HC EVKLVESGGG LVKPGGSLRL SCAASGFTFS NYALSWVRQT CDR1, CDR2, CDR3 PDKRLEWVAS ISSGGATYYP DSVEGRFTIS RDNVRNILYL underlined QMSSLQSEDT AMYYCTR GAY GSDYFDY WGQ GTTLTVSSAK Variable sequence in TTPPSVYPLA PGSAAQTNSM VTLGCLVKGY FPEPVTVTWN italics SGSLSSGVHT FPAVLQSDLY TLSSSVTVPS STWPSETVTC NVAHPASSTK VDKKIVPRDC GCKPCICTVP EVSSVFIFPP KPKDVLTITL TPKVTCVVVD ISKDDPEVQF SWFVDDVEVH TAQTQPREEQ FNSTFRSVSE LPIMHQDWLN GKEFKCRVNS AAFPAPIEKT ISKTKGRPKA PQVYTIPPPK EQMAKDKVSL TCMITDFFPE DITVEWQWNG QPAENYKNTQ PIMDTDGSYF VYSKLNVQKS NWEAGNTFTC SVLHEGLHNH HTEKSLSHSP G 164 hz4F36 VL CDR1 KSSQSLLESD GKTYLN 165 hz4F36 VL CDR2 LVSILDS 166 hz4F36 VL CDR3 LQATHFPQT 167 hz4F36 VL DIVMTQTPLS LSVTPGQPAS ISCKSSQSLL ESDGKTYLNW CDR1, CDR2, CDR3 YLQKPGQSPQ LLIYLVSILD SGVPDRFSGS GSGTDFTLKI underlined SRVEAEDVGV YYCLQATHFP QTFGGGTKVE IK 168 hz4F36 LC DIVMTQTPLS LSVTPGQPAS ISC KSSQSLL ESDGKTYLN W CDR1, CDR2, CDR3 YLQKPGQSPQ LLIY LVSILD S GVPDRFSGS GSGTDFTLKI underlined SRVEAEDVGV YYC LQATHFP QT FGGGTKVE IKRTVAAPSV Variable sequence in FIFPPSDEQL KSGTASVVCL LNNFYPREAK VQWKVDNALQ italics SGNSQESVTE QDSKDSTYSL SSTLTLSKAD YEKHKVYACE VTHQGLSSPV TKSFNRGEC 169 hz4F36 VH CDR1 GFTFSNYAMS 170 hz4F36 VH CDR2 TISRSGSYSY FPDSVQG 171 hz4F36 VH CDR3 LGGYDEGDAM DS 172 hz4F36 VH EVQLVESGGG LVKPGGSLRL SCAASGFTFS NYAMSWVRQT CDR1, CDR2, CDR3 PEKRLEWVAT ISRSGSYSYF PDSVQGRFTI SRDNAKNSLY underlined LQMNSLRAED TAVYYCARLG GYDEGDAMDS WGQGTTVTVS S 173 hz4F36 CH ASTKGPSVFP LAPCSRSTSE STAALGCLVK DYFPEPVTVS Human IgG4 constant WNSGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTKT heavy YTCNVDHKPS NTKVDKRVES KYGPPCPPCP APEFLGGPSV FLFPPKPKDT LMISRTPEVT CVVVDVSQED PEVQFNWYVD GVEVHNAKTK PREEQFNSTY RVVSVLTVLH QDWLNGKEYK CKVSNKGLPS SIEKTISKAK GQPREPQVYT LPPSQEEMTK NQVSLTCLVK GFYPSDIAVE WESNGQPENN YKTTPPVLDS DGSFFLYSRL TVDKSRWQEG NVFSCSVMHE ALHNHYTQKS LSLSLGK 174 hz4F36 HC EVQLVESGGG LVKPGGSLRL SCAAS GFTFS NYAMS WVRQT CDR1, CDR2, CDR3 PEKRLEWVA T ISRSGSYSYF PDSVQG RFTI SRDNAKNSLY underlined LQMNSLRAED TAVYYCAR LG GYDEGDAMDS  WGQGTTVTVS Variable sequence in SASTKGPSVF PLAPCSRSTS ESTAALGCLV KDYFPEPVTV italics SWNSGALTSG VHTFPAVLQS SGLYSLSSVV TVPSSSLGTK TYTCNVDHKP SNTKVDKRVE SKYGPPCPPC PAPEFLGGPS VFLFPPKPKD TLMISRTPEV TCVVVDVSQE DPEVQFNWYV DGVEVHNAKT KPREEQFNST YRVVSVLTVL HQDWLNGKEY KCKVSNKGLP SSIEKTISKA KGQPREPQVY TLPPSQEEMT KNQVSLTCLV KGFYPSDIAV EWESNGQPEN NYKTTPPVLD SDGSFFLYSR LTVDKSRWQE GNVFSCSVMH EALHNHYTQK SLSLSLGK 175 mAb-TFPI-106 VH GAGGTGCAGCTGCTGGAGTCTGGCGGAGGCTTGGTACAGCCTGGGGG nucleic acids GTCCCTGAGACTCTCCTGTGCAGCCTCTGGATTCACCTTTAGCAGCT encoding CDR1, CDR2, ATGCCATGAGCTGGGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTGG CDR3 underlined GTCTCAGCTATTAGTGGTAGTGGTGGTAGCACATACTACGCAGACTC CGTGAAGGGCCGGTTCACCATCTCCAGAGACAATTCCAAGAACACGC TGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCCGTATAT TACTGTGCGATTCTGGGAGCTACTTCGTTATCGGCTTTTGATATCTG GGGCCAAGGGACAATGGTCACCGTCTCGAGC 176 mAb-TFPI-106 VL CAGTCTGTGCTGACGCAGCCGCCCTCAGTGTCTGGGGCCCCAGGGCA nucleic acids GAGGGTCACCATCTCCTGCACTGGGAGCAGCTCCAACATCGGGGCAG encoding CDR1, CDR2, GTTATGATGTACACTGGTACCAGCAGCTTCCAGGAACAGCCCCCAAA CDR3 underlined CTCCTCATCTATGGTAACAGCAATCGGCCCTCAGGGGTCCCTGACCG ATTCTCTGGCTCCAAGTCTGGCACCTCAGCCTCCCTGGCCATCACTG GGCTCCAGGCTGAGGATGAGGCTGATTATTACTGCCAGTCCTATGAC AGCAGCCTGAGTGGTTCAGGGGTATTCGGCGGAGGGACCAAGCTGAC CGTCCTA 177 mAb-TFPI-106 HC GAGGTGCAGCTGCTGGAGTCTGGCGGAGGCTTGGTACAGCCTGGGGG nucleic acids GTCCCTGAGACTCTCCTGTGCAGCCTCT GGATTCACCTTTAGCAGCT encoding CDR1, CDR2, ATGCCATGAGC TGGGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTGG CDR3 underlined; GTCTCA GCTATTAGTGGTAGTGGTGGTAGCACATAC TACGCAGACTC Variable sequence in CGTGAAGGGCCGGTTCACCATCTCCAGAGACAATTCCAAGAACACGC italics TGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCCGTATAT TACTGTGCG ATTCTGGGAGCTACTTCGTTATCGGCTTTTGATATC TG GGGCCAAGGGACAATGGTCACCGTCTCGAGCGCGTCGACCAAGGGCC CATCGGTCTTCCCCCTGGCACCCTCCTCCAAGAGCACCTCTGGGGGC ACAGCGGCCCTGGGCTGCCTGGTCAAGGACTACTTCCCCGAACCGGT GACGGTGTCGTGGAACTCAGGCGCCCTGACCAGCGGCGTGCACACCT TCCCGGCTGTCCTACAGTCCTCAGGACTCTACTCCCTCAGCAGCGTG GTGACCGTGCCCTCCAGCAGCTTGGGCACCCAGACCTACATCTGCAA CGTGAATCACAAGCCCAGCAACACCAAGGTGGACAAGAAAGTTGAGC CCAAATCTTGTGACAAAACTCACACATGCCCACCGTGCCCAGCACCT GAAGCCGCTGGGGCACCGTCAGTCTTCCTCTTCCCCCCAAAACCCAA GGACACCCTCATGATCTCCCGGACCCCTGAGGTCACATGCGTGGTGG TGGACGTGAGCCACGAAGACCCTGAGGTCAAGTTCAACTGGTACGTG GACGGCGTGGAGGTGCATAATGCCAAGACAAAGCCGCGGGAGGAGCA GTACAACAGCACGTACCGTGTGGTCAGCGTCCTCACCGTCCTGCACC AGGACTGGCTGAATGGCAAGGAGTACAAGTGCAAGGTCTCCAACAAA GCCCTCCCAGCCCCCATCGAGAAAACCATCTCCAAAGCCAAAGGGCA GCCCCGAGAACCACAGGTGTACACCCTGCCCCCATCCCGGGAGGAGA TGACCAAGAACCAGGTCAGCCTGACCTGCCTGGTCAAAGGCTTCTAT CCCAGCGACATCGCCGTGGAGTGGGAGAGCAATGGGCAGCCGGAGAA CAACTACAAGACCACGCCTCCCGTGCTGGACTCCGACGGCTCCTTCT TCCTCTATAGCAAGCTCACCGTGGACAAGAGCAGGTGGCAGCAGGGG AACGTCTTCTCATGCTCCGTGATGCATGAGGCTCTGCACAACCACTA CACGCAGAAGAGCCTCTCCCTGTCCCCGGGT 178 mAb-TFPI-106 LC CAGTCTGTGCTGACGCAGCCGCCCTCAGTGTCTGGGGCCCCAGGGCA nucleic acids GAGGGTCACCATCTCCTGC ACTGGGAGCAGCTCCAACATCGGGGCAG encoding CDR1, CDR2, GTTATGATGTACAC TGGTACCAGCAGCTTCCAGGAACAGCCCCCAAA CDR3 underlined; CTCCTCATCTAT GGTAACAGCAATCGGCCCTCA GGGGTCCCTGACCG Variable sequence in ATTCTCTGGCTCCAAGTCTGGCACCTCAGCCTCCCTGGCCATCACTG italics GGCTCCAGGCTGAGGATGAGGCTGATTATTACTGC CAGTCCTATGAC AGCAGCCTGAGTGGTTCAGGGGTA TTCGGCGGAGGGACCAAGCTGAC CGTCCTAGGTCAGCCCAAGGCTGCCCCCTCGGTCACTCTGTTCCCGC CCTCCTCTGAGGAGCTTCAAGCCAACAAGGCCACACTGGTGTGTCTC ATAAGTGACTTCTACCCGGGAGCCGTGACAGTGGCCTGGAAGGCAGA TAGCAGCCCCGTCAAGGCGGGAGTGGAGACCACCACACCCTCCAAAC AAAGCAACAACAAGTACGCGGCCAGCAGCTATCTGAGCCTGACGCCT GAGCAGTGGAAGTCCCACAGAAGCTACAGCTGCCAGGTCACGCATGA AGGGAGCACCGTGGAGAAGACAGTGGCCCCTACAGAATGTTCA Description and sequence composition for antibody SeqID (sequence identification) numbers (Kabat numbering is used when referring to specific residues. VH and VL CDR beginning and end points are defined by using Kabat definitions)

The various features and embodiments of the present invention, referred to in individual sections above apply, as appropriate, to other sections, mutatis mutandis. Consequently features specified in one section may be combined with features specified in other sections, as appropriate. All references cited herein, including patents, patent applications, papers, text books, and cited sequence Accession numbers, and the references cited therein are hereby incorporated by reference in their entirety. In the event that one or more of the incorporated literature and similar materials differs from or contradicts this application, including but not limited to defined terms, term usage, described techniques, or the like, this application controls. 

What is claimed is:
 1. An isolated antibody, or antigen-binding fragment thereof, that specifically binds to an epitope in Kunitz Domain 2 (K2) of Tissue Factor Pathway Inhibitor (TFPI), wherein said epitope comprises residues selected from the group consisting of: (a) residues Ile105, Arg107, and Leu131, according to the numbering of SEQ ID NO:2; (b) residues Ile105, Arg107, Leu131, and one or more residues selected from the group consisting of: Cys106, Gly108, Cys130, and Gly132, according to the numbering of SEQ ID NO:2; (c) residues Ile105, Arg107, Leu131, and one or more residues selected from the group consisting of: Asp102, Arg112, Tyr127, Gly129, Met134, and Glu138, according to the numbering of SEQ ID NO:2; (d) residues Ile105, Arg107, Leu131, and one or more residues selected from the group consisting of: Cys106, Gly108, Cys130, and Gly132, and further comprising one or more residues selected from the group consisting of: Asp102, Arg112, Tyr127, Gly129, Met134, and Glu138, according to the numbering of SEQ ID NO:2.
 2. The antibody or antigen-binding fragment thereof of claim 1, comprising the following heavy (H) chain and light (L) chain residues (numbering according to Kabat): H33 Ala, H58 Tyr, H95 Leu, H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu, H100A Ser, L29 Ala, L31 Tyr, L91 Tyr, L95A Ser, and L95B Gly.
 3. The antibody or antigen-binding fragment thereof of claim 2, comprising the following residues (numbering according to Kabat): (a) H33 is Ala or Val; (b) H47 is Trp; (c) H50 is Ala; (d) H51 is Ile; (e) H52 is Ser, Arg, Lys, Phe, or Tyr; (f) H56 is Ser, Arg, or Lys; (g) H58 is Tyr; (h) H95 is Leu; (i) H96 is Gly, Ala, Arg, Asn, Lys, Pro, Ser, or Val; (j) H97 is Ala; (k) H98 is Thr, His, Ile, Leu, Met, Phe, or Tyr; (l) H99 is Ser; (m) H100 is Leu, Phe, Trp, or Tyr; (n) H100A is Ser, Arg, Asn, Gln, Glu His, Leu, Lys, Met, Phe, Pro, or Trp; (o) L29 is Ala; (p) L31 is Tyr; (q) L91 is Tyr; (r) L95A is Ser, Phe, Trp, or Tyr; (s) L95B is Gly; and t) L95C is Ser, Arg, Asn, Gln, Glu, Ile, Leu, Lys, Met, Phe, Trp, Tyr, or Val; and optionally comprising the following residues: (u) L93 is Ser; (v) L96 is Gly.
 4. An isolated antibody or antigen-binding fragment thereof that specifically binds the K2 of TFPI, wherein the antibody is selected from the group consisting of an antibody comprising: (a) a heavy chain variable region (VH) comprising a VH complementarity determining region one (CDR-H1) comprising the amino acid sequence of SEQ ID NO:38, a CDR-H2 comprising the amino acid sequence of SEQ ID NO:39, and a CDR-H3 comprising the amino acid sequence of SEQ ID NO:40; (b) a VH comprising the amino acid sequence of SEQ ID NO:41; (c) a VH comprising the amino acid sequence of SEQ ID NO:63; (d) a light chain variable region (VL) comprising a VL complementarity determining region one (CDR-L1) comprising the amino acid sequence of SEQ ID NO:33, a CDR-L2 comprising the amino acid sequence of SEQ ID NO:34, and a CDR-L3 comprising the amino acid sequence of SEQ ID NO:35; (e) a VL comprising the amino acid sequence of SEQ ID NO:36; (f) a heavy chain constant region (CH) that comprises the amino acid sequence of SEQ ID NO:20; (g) a light chain constant region (CL) that comprises the amino acid sequence of SEQ ID NO:26; (h) a heavy chain that comprises the amino acid sequence of SEQ ID NO:64; (i) a heavy chain that comprises the amino acid sequence of SEQ ID NO:42; (j) a light chain that comprises the amino acid sequence of SEQ ID NO:37; (k) a CDR-H1 comprising the amino acid sequence of SEQ ID NO:48, a CDR-H2 comprising the amino acid sequence of SEQ ID NO:49 and a CDR-H3 comprising the amino acid sequence of SEQ ID NO:50; (l) a VL comprising a CDR-L1 comprising the amino acid sequence of SEQ ID NO:43, a CDR-L2 comprising the amino acid sequence of SEQ ID NO:44, and a CDR-L3 comprising the amino acid sequence of SEQ ID NO:45; (m) a VH comprising a CDR-H1 comprising the amino acid sequence of SEQ ID NO:38, a CDR-H2 comprising the amino acid sequence of SEQ ID NO:39, and a CDR-H3 comprising the amino acid sequence of SEQ ID NO:40, and a VL comprising a CDR-L1 comprising the amino acid sequence of SEQ ID NO:33, a CDR-L2 comprising the amino acid sequence of SEQ ID NO:34, and a CDR-L3 comprising the amino acid sequence of SEQ ID NO:35; (n) a VH comprising the amino acid sequence of SEQ ID NO:63 and a VL comprising the amino acid sequence of SEQ ID NO:36; and (o) a heavy chain consisting of the amino acid sequence of SEQ ID NO:64 and a light chain consisting of the amino acid sequence of SEQ ID NO:37.
 5. The antibody or antigen-binding fragment thereof of claim 1, wherein said epitope further comprises one or more residues selected from the group consisting of: Glu100, Glu101, Asp102, Gly104, and Tyr109, according to the numbering of SEQ ID NO:2
 6. An isolated antibody, or antigen-binding fragment thereof, that specifically binds to a K2 of TFPI, wherein said epitope comprises residues Glu101, Pro103, Tyr109, Thr111, Ser119, Gln121, Glu123, Arg124, Lys126, and Leu140, according to the numbering of SEQ ID NO:
 2. 7. The antibody, or antigen-binding fragment thereof, of claim 6, comprising (a) a VH comprising a CDR-H1 comprising the amino acid sequence of SEQ ID NO: 87, a CDR-H2 comprising the amino acid sequence of SEQ ID NO: 88, and a CDR-H3 comprising the amino acid sequence of SEQ ID NO: 89; and (b) a VL comprising a CDR-L1 comprising the amino acid sequence of SEQ ID NO: 81, a CDR-L2 comprising the amino acid sequence of SEQ ID NO: 82 and a CDR-L3 comprising the amino acid sequence of SEQ ID NO: 83;
 8. The antibody, or antigen-binding fragment thereof, of claim 1, wherein said antibody is selected from the group consisting of: (a) an antibody comprising at least one paratope residue (numbering according to Kabat) that is within 4.0 Å of at least one epitope residue on TFPI (numbering according to SEQ ID NO:2), as follows: epitope residue 102 Asp is within 4.0 Å of paratope residue H58 Tyr; epitope residue 104 Gly is within 4.0 Å of paratope residue H58 Tyr; epitope residue 105 Ile is within 4.0 Å of paratope residues H33 Ala, H50 Ala, H51 Ile, H52 Ser, H56 Ser, H58 Tyr, H95 Leu; epitope residue 106 Cys is within 4.0 Å of paratope residues H100 Leu, H100A Ser; epitope residue 107 Arg is within 4.0 Å of paratope residue H96 Gly, H97 Ala, H98 Thr, H99 Ser, H100 Leu; epitope residue 108 Gly is within 4.0 Å of paratope residue H100 Leu; epitope residue 112 Arg is within 4.0 Å of paratope residue L29 Ala, L31 Tyr; epitope residue 127 Tyr is within 4.0 Å of paratope residue L31 Tyr; epitope residue 129 Gly is within 4.0 Å of paratope residue L31 Tyr; epitope residue 130 Cys is within 4.0 Å of paratope residue L91 Tyr, L95B Gly; epitope residue 131 Leu is within 4.0 Å of paratope residue H47 Trp, H50 Ala, H58 Tyr, L95A Ser, L95B Gly, L95C Ser; epitope residue 132 Gly is within 4.0 Å of paratope residue H58 Tyr, L95A Ser; H58 Tyr, L95A Ser; epitope residue 134 Met is within 4.0 Å of paratope residue L95A Ser; and epitope residue 138 Glu is within 4.0 Å of paratope residue L29 Ala; (b) comprises at least one paratope residue (numbering according to Kabat) which can form a hydrogen bond with an epitope residue of TFIP (numbering according to SEQ ID NO:2) as follows: epitope residue 102 Asp can form a hydrogen bond with paratope residue H58 Tyr; epitope residue 107 Arg can form a hydrogen bond with at least one paratope residue selected from the group consisting of H96 Gly, H97 Ala, H98 Thr, H99 Ser, and H100 Leu; epitope residue 112 Arg can form a hydrogen bond with paratope residue L29 Ala; epitope residue 127 Tyr can form a hydrogen bond with paratope residue L31 Tyr; and epitope residue 131 Leu can form a hydrogen bond with paratope residue L95B Gly; and (c) an antibody comprising at least one paratope residue (numbering according to Kabat) which comprises a non-zero change in buried surface area due to interaction with an epitope residue (numbering according to SEQ ID NO:2) as follows: epitope residue 102 Asp interacts with paratope residue H58 Tyr; epitope residue 104 Gly interacts with paratope residue H58 Tyr; epitope residue 105 Ile interacts with at least one paratope residue selected from the group consisting of H33 Ala, H34 Met, H50 Ala, H51 Ile, H52 Ser, H56 Ser, H58 Tyr, and H95 Leu; epitope residue 106 Cys interacts with at least one paratope residue selected from the group consisting of H95 Leu, H100 Leu, H100A Ser, and L91 Tyr; epitope residue 107 Arg interacts with at least one paratope residue selected from the group consisting of H96 Gly, H97 Ala, H98 Thr, H99 Ser, and H100 Leu; epitope residue 108 Gly interacts with paratope residue H100 Leu; epitope residue 112 Arg interacts with at least one paratope residue selected from the group consisting of L29 Ala, L31 Tyr, and L93 Ser; epitope residue 127 Tyr interacts with at least one paratope residue selected from the group consisting of L31 Tyr, and L95B Gly; epitope residue 129 Gly interacts with at least one paratope residue selected from the group consisting of H100A Ser, L31 Tyr, and L91 Tyr; epitope residue 130 Cys interacts with at least one paratope residue selected from the group consisting of H95 Leu, H100A Ser, L31 Tyr, L91 Tyr, and L95B Gly; epitope residue 131 Leu interacts with at least one paratope residue selected from the group consisting of H47 Trp, H50 Ala, H58 Tyr, H95 Leu, L31 Tyr, L91 Tyr, L95A Ser, L95B Gly, L95C Ser, and L96 Gly; epitope residue 132 Gly interacts with at least one paratope residue selected from the group consisting of H58 Tyr, and L95A Ser; epitope residue 133 Asn interacts with paratope residue L95A Ser; epitope residue 134 Met interacts with at least one paratope residue selected from the group consisting of L93 Ser, L94 Ser, and L95A Ser; and epitope residue 138 Glu interacts with at least one paratope residue selected from the group consisting of L28 Gly, L29 Ala, and L93 Ser.
 9. An isolated monoclonal antibody that competes for binding to TFPI and/or binds the same epitope as an antibody, or antigen-binding fragment thereof, of claim
 4. 10. The antibody, or antigen-binding fragment thereof, of claim 1, wherein said antibody, or antigen-binding fragment thereof, binds to TFPI with a binding affinity (Kd) value of from about 1×10⁻⁸ M to about 1×10⁻¹⁰ M.
 11. The antibody or antigen-binding fragment thereof of claim 1(a), wherein said antibody or antigen-binding fragment thereof: (i) decreases clotting time as measured in a plasma based dilute prothrombin time assay; (ii) reduces clotting time in whole blood as measured by thromboelastrography; (iii) increases thrombin generation; (iv) increases FXa activity in the presence of TFPI; (v) enhances platelet accumulation in the presence of TFPI; (vi) increases fibrin generation in the presence of TFPI; or (vii) any combination thereof.
 12. The antibody or antigen-binding fragment thereof of claim 11, wherein said plasma or whole blood is deficient in Factor VIII or Factor IX.
 13. An isolated nucleic acid molecule comprising a nucleotide sequence encoding the antibody or antigen-binding fragment thereof of claim
 1. 14. An isolated nucleic acid molecule comprising a nucleotide sequence encoding the antibody of claim
 4. 15. The nucleic acid molecule of claim 14, wherein the nucleotide sequence encodes a VH comprising a CDR-H1 comprising the amino acid sequence of SEQ ID NO:38, a CDR-H2 comprising the amino acid sequence of SEQ ID NO:39, and a CDR-H3 comprising the amino acid sequence of SEQ ID NO:40, and a VL comprising a CDR-L1 comprising the amino acid sequence of SEQ ID NO:33, a CDR-L2 comprising the amino acid sequence of SEQ ID NO:34, and a CDR-L3 comprising the amino acid sequence of SEQ ID NO:35.
 16. The nucleic acid molecule of claim 15, wherein the nucleotide sequence encodes a VH comprising the amino acid sequence of SEQ ID NO:63 and a VL comprising the amino acid sequence of SEQ ID NO:36.
 17. The nucleic acid molecule of claim 14, comprising a nucleotide sequence selected from the group consisting of: (a) the sequence of SEQ ID NO:175; (b) the sequence of SEQ ID NO:176; (c) the sequence of SEQ ID NO:177; (d) the sequence of SEQ ID NO:178; (e) the sequence of the insert present in the plasmid deposited under ATCC Accession No. PTA-122328; and (f) the sequence of the insert present in the plasmid deposited under ATCC Accession No. PTA-122329.
 18. A pharmaceutical composition comprising an antibody or antigen-binding fragment thereof of claim 1, and a pharmaceutically acceptable carrier or excipient
 19. A method of reducing the activity of Tissue Factor Pathway Inhibitor (TFPI) in a subject in need thereof, comprising administering to said subject a therapeutically effective amount of the antibody or antigen-binding fragment thereof of claim
 1. 20. A method of reducing the activity of Tissue Factor Pathway Inhibitor (TFPI) in a subject in need thereof, comprising administering to said subject a therapeutically effective amount of the antibody, or antigen-binding fragment thereof, of claim 4(m).
 21. The method of claim 20, comprising administering to said subject a therapeutically effective amount of the antibody, or antigen-binding fragment thereof, of claim 4(n).
 22. The method of claim 19, said method comprising administering the antibody, or antigen-binding fragment thereof, of claim
 7. 23. A method of shortening bleeding time in a subject in need thereof, comprising administering to said subject a therapeutically effective amount of the antibody, or antigen-binding fragment thereof, of claim
 1. 24. A method of shortening bleeding time in a subject in need thereof, comprising administering to said subject a therapeutically effective amount of the antibody, or antigen-binding fragment thereof, of claim 4(m).
 25. The method of claim 23, said method comprising administering the antibody, or antigen-binding fragment thereof, of claim
 7. 26. The method of claim 23, wherein said subject suffers from or is susceptible to hemophilia A, hemophilia B, von Willebrand Disease (vWD), or a platelet disorder.
 27. The method of claim 23, wherein said subject suffers from or is susceptible to hemophilia A, hemophilia B, von Willebrand Disease (vWD), or a platelet disorder.
 28. The method of claim 19, further comprising administering a therapeutically effective amount of FVIIa.
 29. The method of claim 20, further comprising administering a therapeutically effective amount of FVIIa.
 30. A method of shortening bleeding time in a subject in need thereof, said method comprising administering a therapeutically effective amount of the antibody of claim 1, or antigen-binding fragment thereof, and a clotting agent.
 31. The method of claim 30, wherein said subject suffers from or is susceptible to hemophilia A or hemophilia B and said clotting agent is selected from the group consisting of factor VIIa, factor VIII, factor IX and tranexamic acid.
 32. The method of claim 31, said method comprising administering the antibody, or antigen-binding fragment thereof, of claim 4(m). 